So I put together a JP rimfire kit into an Aero upper and lower, Magpul PRS, with a Hiperfire trigger, black dog mags, seekins handguard, and a known repeatable 25x optic/mount, shooting off a front rest and rear bag. I've built a few .223/6.5 AR's and never really had any problems. I've probably put 200-300 rounds through it.
I've had no functional problems, however the accuracy has been pretty abysmal. I'd say 1-1.5" at 50 yards, 5 shot groups (all the range will allow loaded at once) Federal automatch is probably over 1.5", wolf match, CCI Standard, Federal gold medal are slightly better, best group on the day might have been 3/4". Didn't seem worth wasting Eley Match, Lupua or anything I have that's more expensive if it wouldn't group better with CCI standard, Wolf, or Fed gold medal. I've tried it with and without the threaded barrel protector, accu-wedge, trying to free recoil it and hold it tighter into a relaxed shoulder as I would a centerfire, doesn't seem to make much difference. As a reference my Volquartsen 10/22 is shooting in the 3/8-1/2" groups with CCI standard and Wolf.
I've noticed 2 things but am not sure of the cause.
1) I collected some brass, and while I've had no mis/non fires or rounds that felt/sounded weak/delayed, the firing pin hits on the brass seem very light compared to my other 22's across the various brands of ammo I've tried. Not sure if this might be related to the hiperfire trigger, so I may swap that out.
2) The groups appear to have more vertical stringing to them than horizontal, but it tosses a lot of flyers and it doesn't appear to be the first hand chambered round. Perhaps this is related to #1 if I'm getting poor firing pin hits and weak/variable ignition, but I'm just spitballing.
I can and may put it in a new upper I have a Mega extra thick upper I could try.
Just thought I'd poll other people have seen through their experience that might be causing it, not blaming the JP setup because they have always been top notch quality and I've seen a few of their JP 22 kits shoot pretty amazing.
Thanks,
Todd
I've had no functional problems, however the accuracy has been pretty abysmal. I'd say 1-1.5" at 50 yards, 5 shot groups (all the range will allow loaded at once) Federal automatch is probably over 1.5", wolf match, CCI Standard, Federal gold medal are slightly better, best group on the day might have been 3/4". Didn't seem worth wasting Eley Match, Lupua or anything I have that's more expensive if it wouldn't group better with CCI standard, Wolf, or Fed gold medal. I've tried it with and without the threaded barrel protector, accu-wedge, trying to free recoil it and hold it tighter into a relaxed shoulder as I would a centerfire, doesn't seem to make much difference. As a reference my Volquartsen 10/22 is shooting in the 3/8-1/2" groups with CCI standard and Wolf.
I've noticed 2 things but am not sure of the cause.
1) I collected some brass, and while I've had no mis/non fires or rounds that felt/sounded weak/delayed, the firing pin hits on the brass seem very light compared to my other 22's across the various brands of ammo I've tried. Not sure if this might be related to the hiperfire trigger, so I may swap that out.
2) The groups appear to have more vertical stringing to them than horizontal, but it tosses a lot of flyers and it doesn't appear to be the first hand chambered round. Perhaps this is related to #1 if I'm getting poor firing pin hits and weak/variable ignition, but I'm just spitballing.
I can and may put it in a new upper I have a Mega extra thick upper I could try.
Just thought I'd poll other people have seen through their experience that might be causing it, not blaming the JP setup because they have always been top notch quality and I've seen a few of their JP 22 kits shoot pretty amazing.
Thanks,
Todd