Hi,
I just just installed a new upper on my cast lower and the fit was TIGHT. Both the pivot and take down pins could move freely easily without the upper. The front pivot pin pushed through the upper and lower nicely. But, the take down pin was a PITA. The the holes would not line up. It seemed the upper and lower would not come together close enough near the rear of the receiver.
So eventually I had to soak the holes and pins with CLP to loosen them up. Well, the good news is I got the pin through finally. But, I had to SQUEEZE the upper and lower together with my GI Joe Kung Fu grip to get the holes to align.
Am I going to have to use a rubber mallet every time I need to take down my rifle or is there a way I can loosen the tension on the take down pin? Is it safe to relieve a portion of the holes to allow easier movement of the pin?
Thanks Brad