Charles,I had the same piroblem with 2 in a row of the 392s version.I was using 10 pumps as it says itís rated and both pump arms twisted... one of them in less than 30 shots.I finally called crosman about the problem and was told by the guy I talked to that the 10 pumps is a misprint in the manual and that itís really only rated for 8 pumps! Says heís made crosman aware of this?It definitely needs bracing if going for 10 pumps with the original linkage, as the plastic posts they use for linkage support donĒt Keep it from twisting.Lol, you wonít twist that Mac1 arm and linkage.Donít know how those plastic posts are going to hold though?Iím going to order a Mac1 linkage for mine too... was supposed to have already done that.
I would love to see the wood stock version back.Would also hope they improve the support of the lever on the synthetic model.Seems a simple redesign for full length support of the lever arm would be all thatís needed?I would truly hate to see them discontinue the 392 and 397 all together .BTW, I was also told by the crosman rep. I talked to about this problem to hold the pump arm in the center on the synthetic model when pumping.... that kind of defeats the purpose of an extended pump arm doesínt it?
...Crosman should also adjust the bore size to 5.50 while their at it.
Quote from: Psipumper on October 19, 2021, 02:14:25 PM...Crosman should also adjust the bore size to 5.50 while their at it.So the 392 bores still oversized? I have 101s, 312s, and 342s that shoot better than the 392P and 2 392PAs I've owned. I hope if I keep trying I'll get a great one. Weird thing though, is the 101 bores also seem loose but they still make tighter groups.
What kind of muzzle energy levels are people seeing with Mac 1 steroid builds? Is the steroid build "DIY friendly"? I've looked at the 392s off and on for over a year now. Could a steroid treated 392s fire a cast 20 grain pellet above 650 FPS?
Quote from: Spacebus on November 25, 2021, 05:44:47 PMWhat kind of muzzle energy levels are people seeing with Mac 1 steroid builds? Is the steroid build "DIY friendly"? I've looked at the 392s off and on for over a year now. Could a steroid treated 392s fire a cast 20 grain pellet above 650 FPS?How about 760 FPS. and about 25.6 ft. lbs with a 20 gr. NOE cast pellet?Of course thatís on 14 pumps from my 392pa steroid.8 pumps gives 645 FPS and 18.4 ft. lbs. with the same pellet.6 pumps is 588.9 FPS. and 15.4 ft. lbs.Heavier pellets up to about 30 gr. produce even more ft. lbs.