What are all the revolver mods? so far i have only found the long barrel. i want to see how good i can make my revolver is i put all the mods on, so does anyone know what they all are? and while im on my second play through ive already figured out that weapon mods at shops are random, but if anyone can tell me where possible locations are too, that'd be great.

I have seen the cylinders sold by Chet in Goodsprings and in Novac, and Novac has the long barrels from time to time. The gunrunners had the new frame for the .44 Magnum. For the most part I don't use those mods as Lucky is so awesome.