The free float M-LOKhandguard from Stern Defense offers excellent ergonomics while remaining lightweight and strong. Features a secure clamp on mounting system that ensures that the handguard remains in place even under heavy abuse sustained full auto fire and shooting prone from a bi-pod. Machined from 6061 aircraft grade aluminum and hard-coat anodized for longevity and durability. These handguards also feature quick disconnect swivel holes. Stern 45acp barrels are ideal for gun lovers who want to build their own custom dedicated 45acp AR15 upper group. Mil-Spec flat top upper receiver with Stern Defense laser engraved dust cover and forward assist. Machined from 7075-t6 aluminum and hard-coat anodized. Mil-spec dry film lube in the bore. This uppers ejection port has been enlarged to work with larger rounds like the 45acp and etc. Mil-spec charge handle for AR-15 rifles. The latch is Ergonomically designed and provides a positive grip and easy one hand manipulations while charging your weapon under stressful situations. Made from 6061 aircraft grade aluminum billet and hardcoat anodized. Made with 8620 AISI steel and boasting a Mag-Phosphate finish the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers. It functions with Colt SMG Glock magazines and it’s fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed including firing pin/spring/retaining pin extractor and extractor spring. Also included in bolt assembly is a propriety center and roll pins. The 45 bolts incorporate the new bolt design which caters to single stage triggers with short resets. It also allows use with the JP silent capture spring but is not recommend for 45 acp applications. This bolt is compatible with the law tactical folding stock.