I got my lower today,  tried to put the lower and upper together,  the rear hole in the upper was slightly out of alignment.  The hole in the  upper was too high, I had to drill out the hole a little bit (drilled just the bottom edge of the hole, ) to get the pin to go through.  It now goes through, but is very tight.  However, the upper and lower have no movement between them.  shoud I loosen the fit for the pin, I can push it out and in with my fingers, but it is tough.

Is this tight fit OK?  


all other "fit" seems really tight and good.   Yet to shoot, maybe this weekend.