So just playing around I installed a storm creek barrel and YHM compensator on my M&P 9mm. Not having enough compression to fully cycle the action i dropped the recoil spring all the way down to 12 lbs. have tried factory loads 115gr-147gr and handloads in the same range and all though better, its still not fully cycling and wont eject the spent round or the new round will jam half way. Do i simply need to run hotter rounds or will i be dangerously exceeding pressure thresh holds or is there some other mod to make. its a blast to shoot with the comp on it, about the same recoil and muzzle rise as my mark III .22 Here is a link to the comp im running. maybe just too many ports?
http://yankeehillmachine.com/store/product544.html
thanks
http://yankeehillmachine.com/store/product544.html
thanks