I bought my first lower back around 2013 (Mag Tactical, looks like they have gone out of business) and it has run fine since. I have started shooting more recently and noticed when the bolt is locked back, the selector was hard to put on safe. Then yesterday, the gun started to fire on trigger release too (free binary trigger?). I thought it was a trigger issue, so I swapped in a Gissele SSA-E. The trigger functions fine, but when I put the selector back in and put it on fire, the hammer does not release (full trigger movement seems blocked). I believe it is being blocked by the selector.
Normally, I'd just throw the upper on another lower, but since I live in a state that has banned all barrels except HBAR barrels, I cannot do that with the currently configured upper. Is there anything I can do, or is this lower just good for the trash?