This 5.56x45 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.