Fmtreading

It loads and ejects on the first round all the time.It only locks on 2nd.

So it is all factory dpms parts.I understand it needs to be broken in, but the charging handle locks doesn't get stuck but literally locks up. I have to remove the upper receiver just to remove the round.

so I changed a handguard it was off by just a pinch I gave it weight big mistake as I only needed 30lbs answer was a shim so it got stuck on i removed it i think I warped either the lower receiver or the upper receiver I checked the bcg its well lubed brand new before I messed with it i could manually cycle rounds now i go to load to test cycle first goes in and ejects 2nd goes in and locks charging handle i have to take off upper to get the round out everytime it also scratches the rounds now it didnt do that previously any ideas out there its a low profile gen 1 dpms factory .308 was test fired say 10 rounds now i cant get past 2nd round