ingEneer22
New member
Bad day at the range ! I just finished a 300AAC Blackout 9" AR build. Went to sight in an EOTech and play around a little bit. I got through around 10 rounds of reloaded 150gr FMJ's (my own reloads) then my bolt would not go fully into battery. I cleared the rifle and inspected everything. Tried again with a fresh factory bullet and same thing. After I got home, I cleaned the entire rifle and tried to seat a dummy round. Still couldn't get the bolt to lock. With a little persuasion, I was able to get the bolt to lock up but then it was stuck! I had to beat the charging handle with a wooden block to get it to cycle back. The bullet slid right out so it wasn't the casing that got stuck. This leads me to believe that I have a headspace issue. I'm no gunsmith but I believe that I have negative headspace??? Does that make sense? I don't think that the bullet is being allowed to sit deep enough in the chamber which is preventing the bolt to go into battery. Any idea what could cause this?