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Proof Research AR-15 Stainless Steel Barrel – .300 Blackout – 12.5"
The Proof Research .300 Blackout Stainless Steel Barrel (100530) is engineered for shooters who demand match-grade precision in a traditional, duty-ready package. While Proof is famous for carbon fiber, their 416R Stainless Steel AR barrels are held to the same extreme tolerances and "Match Grade" certification. This 12.5-inch barrel is an ideal choice for a suppressed SBR or pistol build, offering an optimum combination of high tensile strength and the toughness required to withstand the high chamber pressures of the .300 BLK cartridge.
Every barrel is precision-milled with 5-groove rifling and a fast 1:7 twist rate, ensuring that heavy 220gr subsonic rounds remain perfectly stabilized while still delivering surgical accuracy with 110gr supersonic loads. The Pistol-Length gas system provides the reliable cycling needed for a wide variety of ammunition types, and the 416R steel construction offers excellent erosion wear characteristics and natural corrosion resistance. If you are looking for a world-class steel barrel that can handle high strings of fire without losing its zero, the 100530 is a top-tier contender.
Note: Professional installation of the gas block and muzzle device is recommended. All NFA rules apply if building a Short Barreled Rifle.
Key Features
- 416R Stainless Steel: Match-grade steel construction designed for high-pressure durability and extreme accuracy.
- 5-Groove Rifling: Precision-cut for consistent bullet engagement and superior group sizes.
- 2026 Performance Standard: Cryogenically treated and heat-treated to a optimized hardness for long-term bore life.
- Pistol-Length Gas System: Tuned for maximum reliability with both subsonic and supersonic .300 BLK loads.
- Corrosion Resistant: Natural stainless finish protects against the elements and carbon fouling.
- Made in the USA: Proudly manufactured in Montana by Proof Research’s master barrel makers.
Product Specifications
- Brand: Proof Research
- Caliber: .300 Blackout (300 BLK)
- Length: 12.5 Inches
- Material: 416R Stainless Steel
- Finish: Brushed Stainless
- Gas System: Pistol Length
- Twist Rate: 1:7
- Gas Block Journal: .750"
- Muzzle Thread: 5/8x24 TPI
- Rifling: 5-Groove
- Weight: 1 lb 8 oz
- MPN: 100530
- UPC: 843068100530
