The other day I watched a very mediocre western called "An Eye For An Eye" where Patrick Wayne plays a real fast gun who is actually ridiculously slow in it. Anyway, I noticed his short barreled Colt had a bizarre extended grip frame I believe made by Andy Anderson. The back strap is much longer and the trigger guard has a place for the little finger at the bottom. Here's a picture of that grip frame in a 1962 gun magazine I have. The one in the movie was stag.