first ar15...need help

[acj415]

Hello, I'm trying to build my first ar15 and can't seem to attach upper to lower. First pin goes in and the the.rear one seems not to line up together. This is a polymer 80% lower...has anyone.had this problem?

[klewan]

Doesn't look like too much misalignment; time to get the round files out. Just take enough off that it still takes a good bit of effort to get the pin in. After you shoot the gun and do a few more take downs, then it will still be tight and you won't be asking about how to get the slop out of the upper to lower joining....

[acj415]

Thanks

Thanks thought I really messed it up, I filed it down and hammered in the pin...can't wait to take it to the range and test it