Originally Posted by
Benelli B76
We have had problems with the Umarex Colt not indexing correctly when firing single action. The pellet can be up to 20 thou out of line with barrel causing a misfire, or low power shots in single action, although when firing double action there is no problem.The problem can be with the pawl (hand) or with the complete trigger group. Both of these are available as replacements. Another mod we do to get better results from this pistol is after fixing the grip safety, we remove the floppy transfer bar altogether. This means the surface of the hammer needs to be increased by 1.5mm to make up the thickness of the transfer bar. We drill and tap the hammer 3mm and screw a modified bolt into it which has had the head machined down to 1.5mm to hit the valve correctly.After these mods you get really consistent single and double action shooting with the pistol.
Baz