Details
Warden Duty 18 Inch 6MM ARC AR-15 Full Build Kit with Rifle Gas and 15 Inch Keymod Handguard
18 inch 4150 CrMoV barrel in 6MM ARC with 1:7.5 twist rate, nitride finish, rifle length gas system, 15 inch freefloat Keymod handguard, 7075-T6 aluminum upper receiver with M4 feed ramps, nitride finished 8620 steel bolt carrier group, mil-spec M4 charging handle, 6-position buffer tube, carbine buffer and spring, collapsible stock, and GI birdcage flash hider. This full build kit delivers everything needed for a precision oriented 6MM ARC rifle build except the lower receiver.
Key Features
- 18 inch 6MM ARC barrel made from 4150 CrMoV steel with government profile, nitride finish, and 1:7.5 twist rate optimized for heavier 6MM projectiles
- Rifle length gas system provides smoother cycling and reduced recoil impulse with the longer dwell time suited to 18 inch barrels
- 15 inch freefloat Keymod handguard made from aluminum allows accessory mounting without affecting barrel harmonics and covers most of the barrel length
- 7075-T6 aluminum upper receiver with M4 feed ramps and black anodized finish provides reliable feeding and corrosion resistance
- Nitride finished 8620 steel bolt carrier group with 6.5 Grendel II bolt head compatible with 6MM ARC cartridge dimensions
- Complete buffer system includes 6-position buffer tube, carbine buffer, spring, castle nut, end plate, and collapsible nylon reinforced polymer stock
- 5/8x24 threaded muzzle with GI birdcage flash hider compatible with suppressors and muzzle devices using 5/8x24 threads
Perfect For
- Precision oriented shooters wanting 6MM ARC ballistics with rifle length ergonomics
- Long range applications where the velocity advantage of an 18 inch barrel matters
- Hunters who need flat shooting trajectories and wind resistance with moderate recoil
- Builders assembling a complete 6MM ARC rifle with all major components in one package
6MM ARC Optimized Barrel Configuration
The 18 inch barrel length extracts maximum velocity from 6MM ARC while maintaining reasonable overall length and handling. The 1:7.5 twist rate stabilizes heavier 6MM projectiles in the 103 to 108 grain range commonly used for long range shooting and hunting applications. The nitride finish hardens the bore surface and resists throat erosion, extending accuracy over thousands of rounds. The government profile balances weight distribution with stiffness, keeping the barrel light enough for extended shooting sessions while maintaining rigidity under the handguard. The .750 gas block journal provides compatibility with most adjustable gas blocks if you want to further tune the system for suppressed or unsuppressed use.
Rifle Length Gas System Advantage
The rifle length gas system uses the longest standard gas tube length on the AR-15 platform, positioning the gas port further down the barrel. This longer distance between the gas port and the chamber increases dwell time, the period when gas pressure is applied to the bolt carrier. The result is softer recoil impulse, smoother cycling, and reduced wear on internal components compared to mid length or carbine gas systems. With 6MM ARC delivering less gas volume than 5.56 NATO, the rifle length system ensures reliable cycling while keeping bolt carrier velocity controlled.
6MM ARC Compatible Bolt Carrier Group
The nitride finished 8620 steel bolt carrier group includes a 6.5 Grendel II bolt head, which is the correct bolt face diameter for 6MM ARC cartridges. The 6MM ARC uses the same case head dimensions as 6.5 Grendel, requiring a larger bolt face than standard 5.56 NATO bolts. The nitride finish provides superior corrosion resistance and lubricity compared to traditional phosphate or chrome finishes, creating a hardened surface layer that resists wear and reduces friction. This means smoother cycling, easier cleaning, and longer component life. The mil-spec M4 charging handle provides standard ergonomics and reliable operation.
Keymod Handguard and Complete Buffer System
The 15 inch freefloat Keymod handguard extends nearly to the muzzle and allows you to attach lights, grips, bipods, and other accessories using Keymod compatible mounts. The freefloat design means the handguard does not contact the barrel, eliminating pressure points that can shift point of impact as the barrel heats. The complete buffer system includes the 6-position buffer tube, carbine buffer, spring, castle nut, and end plate for secure installation. The collapsible nylon reinforced polymer stock adjusts across multiple positions for different shooting scenarios and user preferences while keeping overall weight manageable.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Lower receiver not included.
