Cobalt327....does that mean that my 760 actually has a"riffled" barrel or is it just marketing hype? Will this button rifling actually spin the BB or pellet enough to matter? If so, I wonder what the twist rate was used? I own two 54 caliber black powder rifles, a Lyman that has a 1 in 60" twist and shoots round balls best, the other has a Traditions with a 1 in 32" twist that shoots sabots best. Truthfully either gun can shoot sabots or round balls but as well as the other. If I shoot round balls out of the Traditions rifle the balls tend to spin out of control and sabots out of the Lyman tend to get like knuckle balls. So if it was in fact rifled, I wonder if it was rifled for bbs or pellets". I'm leaning heavily towards the Mac1 setup. I just had never heard of them, but I like the concept.
I went with the MAC piston kit for my 1972 1400 rebuild. Got excellent results. As to the piston cam over thing. The crosman factory service manual states this, Adjust for piston to just touch. No cam over pre-load. I found a copy of crosman service manual on the web. It looks official too. A lot of miss info around the web.