A decent smith can get 2"@25m,M21
.22 Lr Beretta. The gun starts at 5" long, 11 ozs, ends up being .5" longer. Now that is truly a small gun, and that is really amazing accuracy from it. Some of the guns mentioned in this thread are no smaller or lighter than a Colt Woodsman, with a 4" barrel, and that is a target-gun.