DealThe Radical Firearms 16" M4 barrel features a highly reliable carbine-length gas system, durable melonite finish, and button rifled 1:7 twist to stabilize the heaviest 5.56 and .223 loadings for long range accuracy. Combo includes gas block with factory installed carbine length stainless steel gas tube! from Primary Arms (Product RF-16-1-7-COMBO) |