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Grid Defense .300 Blackout Upper Receiver Up to 25% Off and Coupon Available w/ Free Shipping — 14 models

Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT
Grid Defense .300 Blackout Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
1 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
2 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
3 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
4 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
5 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
6 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
7 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
8 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
9 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
10 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
11 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
12 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
13 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT
14 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT
Grid Defense .300 Blackout Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
15 of 29 images
Grid Defense .300 Blackout Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
16 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
17 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
18 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
19 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
20 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
21 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
22 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
23 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
24 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
25 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
26 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
27 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
28 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT
29 of 29 images
Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT

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Questions & Answers
Is the bolt included with the upper. Or do you purchase that separately?

No BCG or Charging Handle come with it

by 007TopGun, Verified Owner, February 23, 2025
What is the inside diameter of the handguard? Expert Answer

The handguard included with the Grid Defense .300 Blackout Upper Receiver features a 1.365" internal diameter.

by Ethan, Gear Expert, December 16, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
havent shot it yet, my RRA BCG wont insert forward by Glenn Strong, Verified Owner, January 20, 2025
Haven’t shot it yet, my RRA BCG won’t insert forward without a lot of help. Very stiff. Used a buddies more worn BCG and it was a lot better although somewhat stiff.
1/1 found this helpful
Helpful Positive Review
im happy with it by russ, Verified Owner, April 13, 2021
Does what I ask, shoots straight with no issues. Only complaint is the finish scratches pretty easily but I really don’t care about that as long it works. I never heard of this brand prior to buying it, but I would definitely use their products again...
Read More...
10/10 found this helpful
Helpful Negative Review
This isn't about Optics Planet, its about Grid defense/Ghost by SignalBoost1776, January 11, 2024
I'm writing this to let people know about my experience dealing with Grid defense/Ghost firearms, as I bought this straight from them NOT optic planet. I was really excited to get this upper, until I shot it. It looks great but the handguard does not...
Read More...
2/2 found this helpful
Most Recent Reviews
Not too bad. by KLLRTHRTN, Verified Owner, February 2, 2024
I really like the upper. The only reason I gave it 3 stars is that it's not truly complete! It does not come with a BCG or a charging handle.
0/4 found this helpful
Most Recent Reviews
Looks Good by 007TopGun, Verified Owner, January 21, 2025
The Upper looks pretty well made, I have yet to go to the range and test it out. Overall I feel like its going to be an awesome experience because I have been wanting a 300 Blackout for a while now.
Most Recent Reviews
It's great by Jr, Verified Owner, January 13, 2024
It's pretty great for what it cost. Very accurate and feeds and cycles absolutely fine.
Read All 7 Reviews
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Please note, this Complete Upper Receiver does not include a Bolt Carrier Group or Charging Handle.

ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

Product Info for Grid Defense .300 Blackout Upper Receiver

This Grid Defense .300 Blackout Upper Receiver is an excellent addition to any high-quality AR build. Each of these Grid Defense AR15 Upper Receivers comes with an M-LOK free float handguard that allows for the attachment of accessories and allows your barrel to shoot more accurately. The Mil-Spec Grid Defense .300 Blackout Rifle Upper Receiver is constructed from 7075 T6 aluminum that's rugged yet lightweight. These uppers also include a barrel, muzzle device and pistol length gas system. Improve your rifle build by using a Grid Defense 300 Blackout (7.62x35) Upper Receiver.image

Specifications for Grid Defense .300 Blackout Upper Receiver:

Manufacturer: Grid Defense
Caliber: .300 AAC Blackout
Barrel Profile: 4150 Steel Light HBAR
Gas System Length: Pistol Length
Barrel Twist Rate: 1-8
Threads per Inch: 5/8x24
Handguard Type: Free-Float
Gun Model: AR-15
Condition: New
Fabric/Material: 4150 Steel
Gas Block Journal Size-Diameter: .750 in
Handguard Style: Thin Rail
Gun Rail: M-LOK
Gun Type: Rifle
Gun Make: AR Platform
Bolt Carrier Group Included: No
Charging Handle Included: No
Weight: 3.4 lb
Magazine Included: No
Mount Type: M-LOK

Features of Grid Defense .300 Blackout Upper Receiver:

  • Chambered in .300 Blackout (7.62x35)
  • A2 Flash Hider/Dimpled Flash Can
  • 1:8 Twist Barrel
  • Pistol Length Gas System
  • Grid Defense M-Lok Free Float Hand Guard
  • Grid Defense Mil-Spec 7075 T6 Upper Receiver

Package Contents:

  • Grid Defense .300 Blackout Complete Upper Receiver

What firearm models does the manufacturer say Grid Defense .300 Blackout Upper Receiver is compatible with?

The manufacturer says that Grid Defense .300 Blackout Upper Receiver is compatible with AR-15

Grid Defense .300 Blackout Upper Receiver Orderable Models

List of Orderable Models

  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR300FDE , MPN: GD16E14GFR300FDE , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300FDE
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Flat Dark Earth, GD105E9GFR300FDE , MPN: GD105E9GFR300FDE , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300FDE
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Burnt Bronze, GD105E9GFR300BB , MPN: GD105E9GFR300BB , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300BB
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Blue Titanium, GD105E9GFR300BT , MPN: GD105E9GFR300BT , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300BT
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, OD Green, GD105E9GFR300OD , MPN: GD105E9GFR300OD , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300OD
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tungsten Gray, GD105E9GFR300TG , MPN: GD105E9GFR300TG , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300TG
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN300BB , MPN: GD75GDR9FCAN300BB , UPC: 2993867 , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300BB
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, OD Green, GD75GDR9FCAN300OD , MPN: GD75GDR9FCAN300OD , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300OD
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE , MPN: GD75GDR9FCAN300FDE , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300FDE
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Black, GD75GDR9FCAN300BLK , MPN: GD75GDR9FCAN300BLK , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300BLK
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR300GRP , MPN: GD16E14GFR300GRP , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300GRP
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN300GRP , MPN: GD75GDR9FCAN300GRP , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300GRP
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR300BT , MPN: GD16E14GFR300BT , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300BT
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN300BT , MPN: GD75GDR9FCAN300BT , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300BT

Grid Defense .300 Blackout Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tungsten Gray, GD16E14GFR300TG , MPN: GD16E14GFR300TG-DEMO , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300TG-DEMO
  • DEMO, Grid Defense Complete Upper Receiver, .300 Blackout, 7.5in, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9in Octagon M-LOK Hand Guard, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN300FDE , MPN: GD75GDR9FCAN300FDE-DEMO , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300FDE-DEMO
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Tactical Grape, GD105E9GFR300GRP , MPN: GD105E9GFR300GRP , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300GRP
  • Grid Defense Complete Upper Receiver, .300 Blackout, 10.5 inch, Pistol Length, 4150 Steel Light HBAR Barrel, 1-8 Twist, 10.5 inch Hand Guard, A2 Flash Hider, Black, GD105E9GFR300BLK , MPN: GD105E9GFR300BLK , Code: 3Q7-UFH-300BLKUPPER-GD105E9GFR300BLK
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tungsten Gray, GD16E14GFR300TG , MPN: GD16E14GFR300TG , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300TG
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Black, GD16E14GFR300BLK , MPN: GD16E14GFR300BLK , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300BLK
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR300BB , MPN: GD16E14GFR300BB , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300BB
  • Grid Defense Complete Upper Receiver, .300 Blackout, 7.5 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 9 inch Octagon M-LOK Hand Guard, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN300TG , MPN: GD75GDR9FCAN300TG , Code: 3Q7-UFH-300BLKUPPER-GD75GDR9FCAN300TG
  • Grid Defense Complete Upper Receiver, .300 Blackout, 16 inch, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 14 inch M-LOK Rail, A2 Flash Hider, OD Green, GD16E14GFR300OD , MPN: GD16E14GFR300OD , Code: 3Q7-UFH-300BLKUPPER-GD16E14GFR300OD
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