exoninja, I shoot a colt govt 5" for ipsc, and a colt commander lightweight for idpa, and I have notice going back and forth between the guns makes a little difference. For instants I was having trouble shooting my ipsc gun as fast as normal, and someone wihtout knowing asked if I had been shooting a different gun, yes, they sugested that my idpa gun with no work done to it versus my ipsc gun trigger job was going to make a diffence in my shooting, so I shoot my ipsc gun w/out the tungsten guide rod in it for idpa, just to be more consistant in my shooting.