I just swapped out my upper for an aero precision one and am now having a problem.
When i pull the bcg back, the carrier will move but the bolt gets stuck in the chamber. Ill release it allowing the carrier to go forward and close completely and on the second time trying to pull the bolt back it will release. Ill drop the bolt and same thing. First pull back stuck, second attempt released.
I never had this problem with the bolt getting stuck on the previous receiver with the same barrel. It was always smooth.
I did the following checks:
Made sure gas tube not the problem - nope
Tried a different BCG in the gun - no problems
Cleaned and clp'd the problem bolt - no effect
Cleaned chamber - no effect
Tried problem bolt on another gun - no sticking problem on other gun.
Tried different charging handle - same thing
Im lost on this, as there was no problem between this bolt and barrel on the old upper, now there is.
Any ideas or suggestions as to why it is now getting stuck on the first try when i pull back and releasing on the second try??
Thanks guys