Stern Defense AR-15 SD 4 MOD4 Upper Receiver Assembly 40 S&W 4" M-LOK

The Stern Defense AR-15 SD 15 MOD4 Upper Receiver Assembly features a 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. The free float M-LOK handguard from Stern Defense offers excellent ergonomics while remaining lightweight and strong. This handguard is M-LOK compatible to accept your favorite attachments. 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. The unique blast can muzzle device was designed for those who need a device that directs muzzle gasses and blast away from the shooter but want a can that matches the look of an handguard better than a round can. Ma...