This 5.56×45 semi automatic rifle is made by the world renown Zastava Arms factory in Serbia and imported into the U.S. Rifle features an 18.25″ chrome lined barrel threaded 14x1LH with a 1:7 twist. The trunnion is buldged with a 1.5MM receiver. This rifle also features a 3 position gas system so you can quickly and easily adjust to your choice of ammo and muzzle device. These rifles will work a number of 5.56 and .223 AK47 magazines. Comes with 1 30 round magazine.