AR-10mm 16" 'Slick Side' complete M-LOK upper receiver built on a slick side billet upper receiver with LRBHO (Last Round Bolt Hold Open). The upper receiver has a 16" 10mm match grade barrel made of 4150 chromoly steel with a black nitride finish, chambered in 10mm, with a twist rate of 1:16 and 5/8-24 muzzle brake threads. The barrel is finished off with an A2 flash hider.
The pistol caliber "slick side" upper receiver is made from certified 7075-T6 aircraft billet aluminum and is black hardcoat anodized per MIL 8625 Type 3 Class 2. It is compatible with all standard AR-15, AR-9, and AR-45 MIL SPEC components.
The gas system is blowback, and the handguards are a lightweight free-floating rifle length slim M-LOK rail made from aircraft quality aluminum and black hardcoat anodized.
The upper assembly comes with an AR-40 .40 S&W/10mm ramped BCG (Glock/Colt compatible) made from US-made 8620 steel with a mag phosphate finish that is precision milled for use with Glock style AR-45 lower receivers. The charging handle is a MIL SPEC AR-15 CH.