![]() So far this has not happened in light system testing. On a side note: While running the heavier system and a light trigger(Elftmann and JP EZ roller kit) I would occasionally get on the shoulder bump fires when trying to shoot fast or from awkward positions. For USPSA shooters, running minor and/or loading to their specific gun I feel the lighter systems might be the way to go. My thoughts, the heavier setups are probably OK for the guys/girls going out and plinking with higher PF ammo, like factory and defensive stuff. Using hotter ammo, the heavy system may save some wear and tear on the gun by smoothing it out. Yes the lighter stuff doesnt "feel" as good as the heavier stuff, but I'll give up feeling for reduced dot movement any day. ![]() The Hahn buffer and 308 spring gave the most dot movement. Trying all buffer and spring combos, running strings of rapid fire on an 8" plate at 12yds I found that the using the H2 buffer and 223/556 spring gave the least amount of dot movement both when the system bottomed out on opening and when the bolt closed up. Springs were 1) Standard 223/556 carbine 2)JP. Buffers were 1) 4.6oz H2 standard carbine buffer 2) 5.5oz Colt 9mm buffer 3)7oz Hahn sub-cal extended buffer. I loaded up some ammo that would produce an even 130pf out of my 16" barrel(PRD load -.2grs) and grabbed a 3 different buffers, two different springs, and headed to the range to test their effects on dot movement alone. I talked to a few other PCCers and was convinced I should try a lighter operating system and load for the gun. Now I want as little dot movement as possible with no care how the gun feels. Im just plinking.įast forward to PCC happening in USPSA. Down the road I bought a 7oz Hahn sub-cal buffer that smoothed the gun out even more. Yeah the dot would pull off of target when the system bottomed out and when the bolt closed, but who cares. ![]() Recoil impulse was smooth, I liked it when shooting my 130pf PRD ammo, Chrono tests showed my PRD ammo would run mid to upper 140s in PF. I started the gun with a JP 308 recoil spring and colt 5.5oz 9mm buffer. I never looked for any info on what kind of sight movement that would produce. All of my research produced info that said heavy(7-10oz) buffers and heavy(308) springs would give the best felt recoil. As a PRD shooter I thought it would be neat to have an AR that shared all the ammo I was already loading. I built my 9mm AR about a year before we(USPSA) started talking about the division.
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