Hey all! Just got to shoot like 30 rounds with my new barrel job by ADCO it was cut to 13 inches and I started with some 223 brown bear primered case and the gun would not cycle. It fired ejected the spent round but did not chamber the next round. Next I tried some federal xm193f 5.56 M193 ball and I shot it with no problems at all. I'm going to try some different ammo tomorrow will post results then. Have you guys had trouble with any ammo I would love some input thanks!