Rock River Arms Lar-15m, Rock 450b0461 450 Bm Mid A4 Upr Half Ss Upper-450B0461-450B0461

Caliber:.450 bushmasterupper receiver:forged a4barrel:16 inch stainless steel, 1:24 twist, cryogenically treatedmuzzle device:rra operator brake, 5/8-32 threadgas block:low profile gas block, mid-length gas systemhandguard:rra 13 inch extended lightweight free float rail, m-lok compatibleincludes:bolt carrier group, charging handle assembly and one 5 round magazine

Receiver Finish: Black
Type: Complete
Caliber: 450 Bushmaster
Barrel Length: 16"
Barrel Material: Steel
Twist: 1:24"
Barrel Description: Heavy
Barrel Finish: Stainless Steel
Handguards: 13" M-LOK
Handguard Finish: Black
Barrel Length Range: 16" to 16.99"