P
ped87perfect
Reviewed on April 20, 2026Verified Purchase
machining is clean and the threads cut smooth. would buy again
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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
MPN128688
Twist Rate1:7 5R
CoatingStainless
Barrel Length18
Barrel ProfileSPR
Gas System LengthRifle
Thread Pitch5/8x24
Caliber6mm ARC
Proof Research 6mm Arc Ar-Type Ar-15 Barrel - Rifle Length - Stainless Steel - .750" - 18"
Frequently Built With
Based on build data
Wilson Combat Ar-15 Billet Upper Receiver
Upper Receiver
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Daniel Defense Mfr Xl Free Float Ar-15 Handguard - M-Lok - 9"
Handguard
Strike Industries Ar-15 Extended Forward Assist Lightweight Low Profile Red
Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers
Aero Precision Ar-15 Ejection Port Cover Assembly
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.
100%
AR-15100%
CaliberBased on real build data showing which calibers builders choose alongside this product.
100%
6mm ARC100%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
100%
Rifle100%
| Product | Category | Times Built Together |
|---|---|---|
| Wilson Combat Ar-15 Billet Upper Receiver | Upper Receiver | 3 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 3 |
| Daniel Defense Mfr Xl Free Float Ar-15 Handguard - M-Lok - 9" | Handguard | 3 |
| Strike Industries Ar-15 Extended Forward Assist Lightweight Low Profile Red | 3 | |
| Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers | 3 | |
| Aero Precision Ar-15 Ejection Port Cover Assembly | 3 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 6mm ARC | 100% |
| Gas System | Percentage |
|---|---|
| Rifle | 100% |
Builds Featuring This Part
See all 5 →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 | $7680.70 |
 | 13 | $1520.17 |
 | 20 | $4850.42 |
| 19 | $2325.72 |
 | 9 | $1843.40 |
Customer reviews
5.0out of 5
1 global rating