A while back I bought a factory 6 1/2" .45 Colt barrel. I shot it some on my old frame, and lockup seemed very positive. Well, I picked up another frame from my local dealer so I wouldn't have to keep swapping barrels. The new frame doesn't seem to lockup as tight, and I can see a bit of a gap, maybe .002" between the back of the barrel and the breech face. You can't force the gun open or anything, but it just doesn't seem as secure as the old frame. I swapped the locking lugs with another set I have, and it doesn't change. I notice that the lugs don't appear to have the full contact they did in the old setup. Do I carefully stone the lugs, or is it anything to worry about?