Includes 16 inch threaded barrel. Collapsible buttstock with adjustable cheekpiece. Ten inch upper flattop Picatinny rail – allows combinations of iron sights, magnifier, red/green dot sights or night vision. Two additional 5 inch Picatinny side rails for lights and lasers. Includes detachable folding forearm grip on bottom. Magazine holder on buttstock. Unique trigger guard for additional safety when moving tactically. Four mounting points for our Sling Swivel. For Glock 17 9mm using 124 grain +P ammo.