Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 18"
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Proof Research
Overview
The Proof Research 6mm ARC AR-Type Barrel is an 18-inch stainless steel barrel designed with a SPR profile, making it a great choice for precision and versatility. Its 1:8 twist rate is optimized for stabilizing a wide range of bullet weights, while the rifle-length gas system ensures reliable cycling and reduced recoil for improved accuracy. This barrel is commonly found in builds that prioritize the 6mm ARC caliber, catering to shooters looking for enhanced performance in both target shooting and hunting applications.
Specifications
Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 18"
Available Merchants(7)
Prices checked
Price Alert
October 2026 on GunPartPicker
Proof Research 6mm ARC AR-Type AR-15 Barrel - Rifle Length - Stainless Steel - .750" - 18" ranked #80 of the 329 barrels builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #108 of the 1,047 barrels builders have added. Builds with this barrel are nearly all chambered in 6mm ARC, nearly all on rifle-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 5 of the 7 retailers we track have it in stock. It dipped to $569 at Primary Arms for a stretch in October 2026, well under its usual $649, so sales do come around. Buying today, the lowest price is $574.99 at Ammunition Depot.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 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 builds that include this one
Wilson Combat AR-15 Billet Upper Receiver
Silencerco AR-15 Billet Lower Receiver
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
ODIN Works 6.5 Grendel Type II AR-15 Bolt Carrier Group - Nitride
Daniel Defense MFR XL Free Float AR-15 Handguard - M-LOK - 9"
Geissele Automatics AR-15 SSA X Lightning Bow Trigger
Builds Featuring This Part
See all builds →Builds in the community that include the Proof Research 6mm Arc Ar-Type Ar-15 Barrel - Rifle Length - Stainless Steel - .750" - 18"
| Build | Parts | Total |
|---|---|---|
 | 30 | $7800.48 |
 | 13 | $1367.03 |
 | 20 | $3171.82 |
| 19 | $2326.53 |
 | 9 | $1847.93 |
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