AR 15 in a 5.7x28 FN (really 4.5x28)

Posted by: 17man , 09/29/2004, 13:10:26

I built a AR and modifide it to shoot the 5.7x28 . I necked the case down to 17 caliber and built a clip from a M1 carbine and put inside of a regular 223 20 round clip . I bought a 17HMR barrel from brownells { Clark 10/22 17HMR , 9 twist } I bushed the bolt and modifide 223 extractor . It is a blast to go to a PD town and cut loose on them . I has very mild muzzle blast and no recoil . I can shoot 16grain to 30 grain bullets with the 9 twist barrel . I had to make my own dies though and that was kind of a pain . I buit this one with a heavy barrel and it gets kinda heavy toating around , so the next one is going to be as light as I can build with maybe a tension barrel with aluminum sleeve and maybe a carbon fiber lower if I can find one . Later ! Mark.