Thanks for that Matt,you can rest easy i wont be hacking any lumps off of the ramps then, my main aim was just to smooth things out and blend in the transfer ports at the case/barrel interface.At the rear of the barrel is a small rectangular port that mates with a similar port in the case but the port in the barrel is about 1mm smaller all around than the opening in the case, would you suggest chamfering this to match the cases?Thanks again!