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Any AR mil spec barrel will work in with this builder kit
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Any AR mil spec furniture will work with this builder kit
- Semi-Automatic, Direct Impingement Gas System
- Rotating, Locking Bolt
- Recoil System Housed Completely within Upper Receiver
- Right Side Charging and Ejection
- Compatible with Mil-Spec AR magazines, grips, stocks, and trigger systems
Pair up your own AR mil spec barrel and furniture with our J180 builder kit!
- AR Grip is included
- AR barrel, forearm, dust cover kit and stock are NOT included with this kit.
.378 Rim Dia. X .125 Bolt Face Depth
- .223 / 5.56
- .204 Ruger
- .350 Legend
- .300 Blackout
.441 Rim Dia. X .125 Bolt Face Depth
- 6.5 Grendel (Type 1)
- 6 mm ARC
- 7.62 X 39