Bear Creek Arsenal, Llc Ar-15 Complete 10.5″ 5.56 Mm Upper Receiver M-Lok
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The Bear Creek Arsenal AR-15 complete 10.5″ 5.56mm upper receiver with M-LOK handguard from features a parkerized barre with 1:7 twist. The AR-15 complete 10.5″ 5.56mm upper receiver with M-LOK by Bear Creek Arsenal uses a carbine length gas system as well as a flat top receiver as well as the standard carrier group and charging handle 4150 chrome moly vanadium 10″ M-LOK Handguard BCA does not recommend using steel cased ammunition with this receiver The AR-15 complete 10.5″ 5.56mm upper receiver with M-LOK uses a carbine length gas system. Mfg: Bear Creek Arsenal, Llc