AR-15 complete 12.7×42 rifle length upper has an 16″ parkerized heavy barrel, and features a 1:20 twist rate, with a carbine gas system
- 15″ MLOK Rail
- M4 flat-top 7075 billet aluminum upper receiver
- AR15 bolt carrier group
- Flash hider
- Rear charging handle
This 12.7×42 is compatible with any mil-spec AR-15 lower. This Slick Side upper has no forward assist or dust cover. This has the new handguard.