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Questions & Answers
What’s the length from receiver to gas block?

This uses the pistol length gas system. The receiver face to the gas journal shoulder is 3.787".

by RyanT, Verified Owner, November 12, 2025
Does it come with gas tube and gas block? Expert Answer

The Proof Research PR15 Stainless Steel 300BLK Rifle Barrel will not include a gas block or gas tube.

by Ethan, Gear Expert, October 18, 2022
Customer Reviews
Helpful Positive Review
12.5 inch proof research ar barrel. by Tactical cobow, Verified Owner, December 21, 2023
I really like this barrel accurate as all heck.I built an ar pistol with this barrel and I used a geissele 10.5 inch mk4 rail with a superlative arms adjustable gas block and I'm running a primary arms micro prism 3x on top.
5/5 found this helpful
Most Recent Reviews
fantastic barrel by Pasquale Cancelliere, Verified Owner, February 18, 2025
This barrel was for a very special build. It feels extremely solid and the fisnish is literally flawlessly. The insertion onto my PrI upper was very tight absolutely wobble or lean, consistent with a perfect fit. I will leave a second review after th...
Read More...
Read All 2 Reviews
Color:
Silver
Caliber:
.300 AAC Blackout
Barrel Length:
12.5 in
Barrel Profile:
Contour 0.75GB
Gas System Length:
Pistol Length
Gas Block Journal Size-Diameter:
.750 in
Barrel Twist Rate:
1-7
Flutes:
No
Gun Make:
AR Platform
Gun Model:
AR-15
Weight:
1.5 lb
Condition:
New
Gun Type:
Rifle
Firearms Threads Per Inch:
5/8x24

Code: 2SB-ATB-PR15SSB-100530

MPN: 100530

UPC: 843068100530

List: $749.00Save 13%
$649.00

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Product Info for Proof Research PR15 Stainless Steel 300BLK Rifle Barrels

Tested and recommended by the National Tactical Officers Association (NTOA) a "Best In Class" barrel that proves to both novice and veteran shooters that there is nothing to fear from a lighter-weight barrel. With so many variables to take into account when crafting a rifle build; one of the most important aspects that can be overlooked is the barrel. This is why when you're going to build your own custom AR-15 upper half, one of the most crucial aspects you must consider is the barrel. Proof Research believes their stainless steel PR15 stainless barrels outperform any other aftermarket barrels in its class. These high-quality barrels hold zero exceptionally well and are designed to produce less felt recoil for quicker target acquisition. Also, PROOF Reseaerch PR15 stainless Rifle Barrels are cold hammer forged, just like the bolts and pistons of any Proof Research products.image

Specifications for Proof Research PR15 Stainless Steel 300BLK Rifle Barrels:

Manufacturer: Proof Research
Color: Silver
Fabric/Material: Stainless Steel
Caliber: .300 AAC Blackout
Barrel Length: 12.5 in
Barrel Profile: Contour 0.75GB
Gas System Length: Pistol Length
Gas Block Journal Size-Diameter: .750 in
Barrel Twist Rate: 1-7
Flutes: No
Gun Make: AR Platform
Gun Model: AR-15
Weight: 1.5 lb
Condition: New
Gun Type: Rifle
Firearms Threads Per Inch: 5/8x24

Features of Proof Research PR15 Stainless Steel 300BLK Rifle Barrels:

  • Pistol Length Barrel
  • Chambered in .300 BLK
  • Stainless Steel Design

Package Contents:

  • Proof Research PR15 Stainless Steel 300BLK Rifle Barrels

Proof Research PR15 Stainless Steel 300BLK Rifle Barrels Orderable Models

List of Orderable Models

  • Proof Research PR15 Stainless Steel 12.5in 300BLK Pistol Length Rifle Barrel, 30cal, 0.75GB, 7 Twist, 5/8 x 24, 100530 , MPN: 100530 , UPC: 843068100530 , Code: 2SB-ATB-PR15SSB-100530

Proof Research PR15 Stainless Steel 300BLK Rifle Barrels Unavailable & Discontinued Models

List of Unorderable Models

  • Proof Research PR15 Stainless Steel 12.5in 300BLK Pistol Length Rifle Barrel, 30cal, 0.75GB, 8 Twist, 5/8 x 24, 100554 , MPN: 100554 , UPC: 843068100554 , Code: 2SB-ATB-PR15SSB-100554
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