Hk sl8 , hk sl8 for sale The Heckler & Koch SL8, produced by Heckler & Koch, is a semi-automatic rifle and serves as the civilian counterpart to the military Heckler & Koch G36.This rifle is designed to shoot the .223 Remington or 5.56×45mm NATO cartridge and utilizes detachable magazines, with options for 10, 20, or 30-round capacities based on the rifle variant. Notably, the SL8 deviates from earlier HK rifles’ traditional roller lock bolt mechanism, adopting a lug-type rotating bolt system reminiscent of the AR-18.