I am putting together my first AR. I have a AR57 brand lower and a Alexandria Arms stripped upper. Just installed my stock kit so was trying fitment of the upper and lower. It won't go together. I tried my del-ton upper that's done and it's the same thing.
Installing upper by using front pin first then seating it the rest of the way. There is maybe 1/8inch gap or less. Rear takedown pin just won't go through. Tried smacking it with my hand and nothing. Also tried moving the parts in and out to see if i could see some wear on the new finish to figure out where it is catching at. So far i cannot find it. Not sure if it's the lug or the back side of the upper.
Any ideas? Find the problem and file it down??
Installing upper by using front pin first then seating it the rest of the way. There is maybe 1/8inch gap or less. Rear takedown pin just won't go through. Tried smacking it with my hand and nothing. Also tried moving the parts in and out to see if i could see some wear on the new finish to figure out where it is catching at. So far i cannot find it. Not sure if it's the lug or the back side of the upper.
Any ideas? Find the problem and file it down??