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Grid Defense 5.56 Upper Receiver Up to 20% Off w/ Free S&H — 11 models

Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB
Grid Defense 5.56 Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
1 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
2 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
3 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
4 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
5 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
6 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
7 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
8 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
9 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
10 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB
11 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB
Grid Defense 5.56 Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
12 of 23 images
Grid Defense 5.56 Upper Receiver, Black, Blue Titanium, Burnt Bronze, Flat Dark Earth, OD Green, Tactical Grape
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
13 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
14 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
15 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
16 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
17 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
18 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
19 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
20 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
21 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
22 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB
23 of 23 images
Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB

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Questions & Answers
What bolt carrier groups are Compatible with this upper? Expert Answer

Any standard AR-15 .223/5.56 bolt carrier group will work. We carry hundreds of options found on our website.

by Armando R., Gear Expert, February 12, 2020
See 1 More Answer
will the Aero Precision Melonite Gas Tube carbine length work on the 5.56 10.5 inch barrel that also says carbine length gas system? Expert Answer

Please email us at techsales@opticsplanet.com.

by Hunter, Gear Expert, September 6, 2023
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
Inaccurate by SaticfiesButNotHappy, Verified Owner, July 11, 2023
Pay attention! THIS IS NOT A COMPLETE UPPER. You will not get a charging handle or a BCG. But the quality is fair for the budget. Its accurate enough for coyotes and it zeroed well i dont have a bunch of odd fliers.
1/2 found this helpful
Helpful Positive Review
absolutly love this upper! by Gdiaz, Verified Owner, March 14, 2022
great quality no feeding issues at all. highly recomend! Worked great on every lower I put it on. Very comfortable slim profile. Great job! I have been using it for a couple months now and have over 500 rounds through it I would have more but ammo pr...
Read More...
6/7 found this helpful
Helpful Positive Review
Good upper receiver. Nice fit and finish. by Michael, July 20, 2020
I bought the 5.56 16-1/2" barrel upper for a MIL spec M4 build. I was very pleased with the fit and finish. Headspace, clocking, etc. are good. Barrel extension has no visible tool marks or small burrs. The feed ramps have no hang ups and are smooth,...
Read More...
9/9 found this helpful
Helpful Positive Review
Works great for me by Sasquatch, Verified Owner, February 4, 2024
I paired the 10.5" barreled upper receiver from Grid Defense with a BCG and charging handle from Anderson Mfg and a carbine-buffered lower with pistol brace from PSA. I have had it to the range one time so far. I ran about 50 rounds of PMC 223 throu...
Read More...
1/1 found this helpful
Most Recent Reviews
Well constructed by Mandolinman7, Verified Owner, July 11, 2025
This is a well made upper for my needs as an AR-Pistol for home defense.
Most Recent Reviews
Built the Burnt Bronze Bomber by Mel, Verified Owner, March 25, 2024
The only reason why I chose the burnt bronze was at the time the only one in a 10.5-inch barrel. So I bought a BCG and a PSA lower to complete it. Michael and Sasquatch had excellent reviews so no need to repeat what they said. Some of you may know t...
Read More...
Read All 7 Reviews
11 Models Available
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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 P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for Grid Defense 5.56 Upper Receiver

Complete your rifle build with this impressive Grid Defense 5.56 Upper Receiver. Grid Defense constructed these Mil-Spec AR15 Upper Receivers from 7075 T6 aluminum for a durable structure at a lighter weight. Every Grid Defense 5.56x45mm NATO Upper Receiver comes with an M-LOK free float handguard that accepts compatible accessories and doesn't interfere with your barrel. Craft a top-shelf weapon with the help of this Grid Defense 5.56 AR Upper Receiver.image

Specifications for Grid Defense 5.56 Upper Receiver:

Manufacturer: Grid Defense
Caliber: 5.56x45mm NATO
Barrel Profile: 4150 Steel M4
Barrel Twist Rate: 1-7
Handguard Type: Free-Float
Gun Model: AR-15
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
Weight: 3.3 lb
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Condition: New
Mount Type: M-LOK

Features of Grid Defense 5.56 Upper Receiver:

  • Chambered in 5.56x45 NATO
  • 7075-T6 Milspec Upper Receiver
  • 1:7 Twist Barrel - Black Nitride
  • A2 Flash Hider/Dimpled Flash Can

Package Contents:

  • Grid Defense 5.56 Complete Upper Receiver

What firearm models does the manufacturer say Grid Defense 5.56 Upper Receiver is compatible with?

The manufacturer says that Grid Defense 5.56 Upper Receiver is compatible with AR-15

Grid Defense 5.56 Upper Receiver Orderable Models

List of Orderable Models

  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK , MPN: GD75GDR9FCAN556BLK , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556BLK
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Burnt Bronze, GD105E9GFR556BB , MPN: GD105E9GFR556BB , Code: 3Q7-UFH-556UPPER-GD105E9GFR556BB
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tungsten Gray, GD105E9GFR556TG , MPN: GD105E9GFR556TG , Code: 3Q7-UFH-556UPPER-GD105E9GFR556TG
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Blue Titanium, GD105E9GFR556BT , MPN: GD105E9GFR556BT , Code: 3Q7-UFH-556UPPER-GD105E9GFR556BT
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Tactical Grape, GD105E9GFR556GRP , MPN: GD105E9GFR556GRP , Code: 3Q7-UFH-556UPPER-GD105E9GFR556GRP
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tungsten Gray, GD75GDR9FCAN556TG , MPN: GD75GDR9FCAN556TG , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556TG
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Burnt Bronze, GD16E14GFR556BB , MPN: GD16E14GFR556BB , Code: 3Q7-UFH-556UPPER-GD16E14GFR556BB
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Flat Dark Earth, GD16E14GFR556FDE , MPN: GD16E14GFR556FDE , Code: 3Q7-UFH-556UPPER-GD16E14GFR556FDE
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Burnt Bronze, GD75GDR9FCAN556BB , MPN: GD75GDR9FCAN556BB , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556BB
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, OD Green, GD75GDR9FCAN556OD , MPN: GD75GDR9FCAN556OD , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556OD
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Tactical Grape, GD75GDR9FCAN556GRP , MPN: GD75GDR9FCAN556GRP , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556GRP

Grid Defense 5.56 Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR556GRP , MPN: GD16E14GFR556GRP , Code: 3Q7-UFH-556UPPER-GD16E14GFR556GRP
  • DEMO, Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tactical Grape, GD16E14GFR556GRP , MPN: GD16E14GFR556GRP-DEMO , Code: 3Q7-UFH-556UPPER-GD16E14GFR556GRP-DEMO
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Tungsten Gray, GD16E14GFR556TG , MPN: GD16E14GFR556TG , Code: 3Q7-UFH-556UPPER-GD16E14GFR556TG
  • DEMO, Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Black, GD75GDR9FCAN556BLK , MPN: GD75GDR9FCAN556BLK-DEMO , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556BLK-DEMO
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, OD Green, GD16E14GFR556OD , MPN: GD16E14GFR556OD , Code: 3Q7-UFH-556UPPER-GD16E14GFR556OD
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Flat Dark Earth, GD105E9GFR556FDE , MPN: GD105E9GFR556FDE , UPC: 2993942 , Code: 3Q7-UFH-556UPPER-GD105E9GFR556FDE
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Black, GD105E9GFR556BLK , MPN: GD105E9GFR556BLK , Code: 3Q7-UFH-556UPPER-GD105E9GFR556BLK
  • Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, OD Green, GD105E9GFR556OD , MPN: GD105E9GFR556OD , Code: 3Q7-UFH-556UPPER-GD105E9GFR556OD
  • USED Grid Defense Complete Upper Receiver, 5.56mm, 10.5 inch, Carbine Length, 4150 Steel M4 Barrel, 1-7 Twist, A2 Flash Hider, Flat Dark Earth, GD105E9GFR556FDE, EDEMO1, Used, Condition Like New , MPN: GD105E9GFR556FDE-EDEMO1 , Code: 3Q7-UFH-556UPPER-GD105E9GFR556FDE-EDEMO1
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Blue Titanium, GD75GDR9FCAN556BT , MPN: GD75GDR9FCAN556BT , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556BT
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Blue Titanium, GD16E14GFR556BT , MPN: GD16E14GFR556BT , Code: 3Q7-UFH-556UPPER-GD16E14GFR556BT
  • Grid Defense Complete Upper Receiver, 5.56mm, 7.5 inch, Pistol Length, 4150 M4 Barrel, 1-7 Twist, 9 inch Octagon M-LOK Rail, Dimpled Flash Can, Flat Dark Earth, GD75GDR9FCAN556FDE , MPN: GD75GDR9FCAN556FDE , Code: 3Q7-UFH-556UPPER-GD75GDR9FCAN556FDE
  • Grid Defense Complete Upper Receiver, 5.56mm, 16 inch, Carbine Length, 4150 M4 Barrel, 1-7 Twist, 14 inch M-LOK Rail, A2 Flash Hider, Black, GD16E14GFR556BLK , MPN: GD16E14GFR556BLK , Code: 3Q7-UFH-556UPPER-GD16E14GFR556BLK
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Last updated 2026-09-30 UTC.