while at the range today gun ran great for 75 rounds but at one time just had a click like a dry fire eject the round and the primer was untouched. Reload round in mag and rake the bolt and she ran like a dream for 30 more rounds. from what i could tell the bolt was in battery but it might not have been not sure and i admit i didnt check it before each round. Just cant understand what happened. The gun is a SAI M1A with only 120 round through it. You guys have any idea what may be going one because im baffled.