I have started to lose sleep over this. I have owned many 9mm 1911s, and my experience has been that Dan Wesson and Springfield Armory RO's had the softest feeling impulse and the muzzle hardly moved. Other's (Colt) have been OK, but nothing to write home about. Fast forward a few years later, and I have recently really started to train again. I am running my Wilson Combat CQB in 9mm. After a few thousand rounds, I am noticing really nasty contact marks on my slide stop. I see slight indents on my lower lugs. I cannot say for certain if this is barrel bump - I am not a gunsmith. I thought it was me just being loopy, but recoil impulse feels "irratic" when I go side by side with other 1911s in 9mm. The gun is using a #19 MS and I've tried both #12.5 chrome silicon and a #11 chrome silicon. So is there any correlation to what I am experiencing with the fact that there may be barrel bump going on with this gun? Let me see if I can get pictures up.