The Alexander Arms® .17 HMR AR-15 rifle features a standard 18" stainless steel, button-rifled 1:10" twist barrel with straight flutes, muzzle threaded 1/2-28RH for standard .223/5.56 muzzle devices, with a six vent A1 flash hider included. The standard trigger is a military-style AR-15 trigger. The standard handguard is our G10 fiberglass composite, non-vented, mid-length free-floating tube. Standard butt stock is the adjustable, M4-style, six-position stock. The rifle ships in a soft carry bag with two 10-round magazines. As pictured, this rifle features optional upgrades.