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Questions & Answers
Does this barrel have a 1 in 8 twist or 1 in 7? The info states 8, but according to spikes website and product number it says it has a 1 in 7. Expert Answer

You are correct, it has a 1/7 rifling. I will have the listing corrected.

by Tom B, Gear Expert, September 20, 2021
I am not having full cycles with proper engagement of the next round almost feel its under gased. What would you use for a buffer and spring? Expert Answer

You could try going a step lighter on your buffer. Personally I would have started at an H2 and assessed from there. If that's too heavy I would go lighter and or reach out to Spikes for advice.

by Tom B, Gear Expert, September 20, 2021
Customer Reviews
Helpful Positive Review
A win win for me! by Merryjlt, Verified Owner, August 1, 2018
So I am already a huge Spike’s fan. Not only do I own their products already but I actually stay in the same town. Optics Planet is wise to offer their merch but here’s the amazing part. They already had a 10% discount on select items and who doesn’t...
Read More...
7/7 found this helpful
Most Recent Reviews
Nice upper by Blake, Verified Owner, April 7, 2024
Bought this and mated it to a spikes tactical lower. So far so good. Optics planet doesn’t disappoint with their prices either. Would recommend.
Read All 2 Reviews
Caliber: .300 AAC Blackout Barrel Length: 8.3 inGas System Length: Pistol Length Muzzle Device: Barking Spider Finish: Anodized Color: Black Additional Features: w/10in BAR2 & Barking Spider Condition: New Magazine Included: Yes Country of Origin: USA

Code: 2A8-URC-3BO8FURB2-STU3005-R1B

MPN: STU3005-R1B

UPC: 815648022778

Product No Longer Available

Product Info for Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2

With a Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2 & Barking Spider, you get premium components to build out a powerful firearm. These AR15 Upper Receivers brought to you by Spikes Tactical are precision-machined from 7075 T6 aluminum to create an incredibly rugged and lightweight structure that will deliver repeatable results in the field. This Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver Package comes with an 8-inch BAR2 rail and a phosphate coated BCG that enhances your weapon's reliability and precision. Plus, it has a .750-inch gas block seat so that you can use your firearm with a variety of accessories. A free-floating barrel and forward assist to ensure safe operation let this one of a kind Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2 & Barking Spider Attachment complete the package. Spikes Tactical carefully crafted each part of this upper to ensure your rifle is the strongest and most reliable it can be. Pick up your Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver Package to create a reliable, dependable weapon platform that will perform at your expectations.image

Features of Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2:

  • Forged Upper Receiver - 7075 T6 Construction, Forward Assist, Ejection Port Door, Ejection Port Door Spring, Ejection Port Door Rod
  • 8.3" Premium Barrel - Machined from Douglas Blank, 1/7 Twist Rate, 5/8 X 24 Thread Pitch for Muzzle, 300 Black Out Chamber, .750 Gas Block Seat, M4 NIB Coated Feed Ramps, Black Nitride In and Out
  • 10" BAR2 Rail - 6061 T6 Rail, Continuous Top Rail, Free Floating 1 Piece, Q.D. Attachment Points, Stainless Steel Heat Shield
  • Low Profile Gas Block - Solid Billet Steel, .750 I.D.
  • Pistol Gas Tube - Black Nitride Inside and Out, Gas Tube Roll Pin
  • Charging Handle - Forged Aluminum, Mil-Spec Type 3 Coating
  • Phosphate M16 Complete BCG - Phosphate Coated, Laser Engraved with ST Spider logo, High Pressure Tested (HPT), Magnetic Particle Inspected (MPI)
  • Barking Spider Muzzle Device
  • Weight: 3lb 15oz

Package Contents:

  • Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2

Ammunition

144 / 44
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Spikes Tactical 300 Black Out 8.3in Forged Upper Receiver w/10in BAR2 Unavailable & Discontinued Models

List of Unorderable Models

  • Spikes Tactical Upper 300BLK 8.3in MP w/10in BAR2 & Barking Spider, STU3005-R1B , MPN: STU3005-R1B , UPC: 815648022778 , Code: 2A8-URC-3BO8FURB2-STU3005-R1B
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