Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 16"
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Proof Research
Overview
The Proof Research 6mm ARC AR-Type AR-15 Barrel is a 16-inch barrel designed for optimal performance with the 6mm ARC cartridge. Featuring a SPR profile and a 1:7.5 twist rate, this barrel ensures stability and accuracy, making it well-suited for precision shooting. The rifle-length gas system promotes smoother cycling, which is beneficial for maintaining consistent operation in your builds. This barrel is commonly found in precision-oriented setups that take advantage of the 6mm ARC's capabilities.
Specifications
Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 16"
August 2026 on GunPartPicker
Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 16" ranked #51 of the 298 barrels builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #114 of the 812 barrels builders have added. Builds with this barrel are nearly all chambered in 6mm ARC, nearly all on rifle-length gas, and mostly AR-15 (75%, then AR-10 25%).
It was hard to find in August 2026, in stock on only 16 of the 27 days we checked, and today 3 of the 6 retailers we track have it in stock. Prices barely moved in August 2026, holding around $649, so there haven't been real sales lately. Buying today, the lowest price is $649 at Optics Planet, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Read the guide: AR-15 Barrel Length & Brand Report →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the 13 builds that include this one
Wilson Combat AR-15 Billet Upper Receiver
Geissele Automatics MK16 15" Super Modular Rail M-LOK Ddc
Daniel Defense Complete Bolt/carrier Group, M16
Radian Weapons AR-15 Raptor-SD Ambidextrous Charging Handle OD Green
Wilson Combat Wc-15 Billet Lower Receiver
Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
Builds Featuring This Part
See all 3 →Builds in the community that include the Proof Research 6mm Arc Ar-Type Ar-15 Barrel - Rifle Length - Stainless Steel - .750" - 16"
| Build | Parts | Total |
|---|---|---|
 | 12 | $1761.87 |
 | 6 | $3850.88 |
 | 19 | $1389.63 |
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