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- Thread starter johhny12gauge
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A A2 rifle buffer weight is about 5.2Oz . A 9mm buffer is a wee bit more at about 5.5Oz
Therefore, if its not cycling properly with A2 , a 9mm will not be any better
What loads are you shooting ....115gr , 125 gr ?
Just to clarify, gun does not strip off another round and does NOT lock open ? or it does lock open on empty mag
Because if it does lock open, its not your load / buffer etc because bolt is travelling back far enough
It is a mag block adjustment generally that is the case. Depending on your mag block ( Hahn is the best BTW ) some are finicky on where they sit
I have had a RRA where if you didn't push it up as far as possible before tightening, it would not strip a round off reliably on some magazines
One of my lowers has Timiny 667 ( 3# ) it has not problems in my 9mm . Your 670 has even heavier hammer spring . No reason for light primer strikes due to trigger
Further to that, I shoot lots of 9Major ( over loaded 9mm that pushes 124gr @ over 1400 out of a pistol) that requires small RIFLE primers , which have harder cups. I never get light primer strikes with any of my lowers, all of which have less than 4 lb pull
I would check your firing pin protrusion . Only time I have seen this in ( no in AR ) is primers set too deep. Compare your reloads to some known working rounds
Therefore, if its not cycling properly with A2 , a 9mm will not be any better
What loads are you shooting ....115gr , 125 gr ?
Just to clarify, gun does not strip off another round and does NOT lock open ? or it does lock open on empty mag
Because if it does lock open, its not your load / buffer etc because bolt is travelling back far enough
It is a mag block adjustment generally that is the case. Depending on your mag block ( Hahn is the best BTW ) some are finicky on where they sit
I have had a RRA where if you didn't push it up as far as possible before tightening, it would not strip a round off reliably on some magazines
One of my lowers has Timiny 667 ( 3# ) it has not problems in my 9mm . Your 670 has even heavier hammer spring . No reason for light primer strikes due to trigger
Further to that, I shoot lots of 9Major ( over loaded 9mm that pushes 124gr @ over 1400 out of a pistol) that requires small RIFLE primers , which have harder cups. I never get light primer strikes with any of my lowers, all of which have less than 4 lb pull
I would check your firing pin protrusion . Only time I have seen this in ( no in AR ) is primers set too deep. Compare your reloads to some known working rounds
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Strange ....generally if bolt ( or bolt carrier in non 9mm ARs ) is moving back far enough to strip a round off , it should also strip around off top of mag
Eventhough the buffer weight is about the same, I would swap back to your carbine stock just for a test
Does it strip rounds off the magazine 100% when manually cycling ?
Eventhough the buffer weight is about the same, I would swap back to your carbine stock just for a test
Does it strip rounds off the magazine 100% when manually cycling ?
It's usually best to do one mod at a time, that way you know right away what works and what doesn't. I would start with removing the BAD lever first then test, then go back to the carbine buffer setup, I doubt it is your trigger since you are having more issues than just light strikes.
Have you tried factory ammo in it yet? Maybe it's your handloads but if it's locking back then they sound like they are strong enough to cycle it fully. When in doubt use factory loads then go back to your loads and compare results.
Good luck.
Have you tried factory ammo in it yet? Maybe it's your handloads but if it's locking back then they sound like they are strong enough to cycle it fully. When in doubt use factory loads then go back to your loads and compare results.
Good luck.
Ditchdogger
CGN frequent flyer
This is just a hunch that you may want to check out. I bought a 5.5'' barreled 9mm top end off of another member and found that my reloaded 9mm will not chamber properly. they are to big for the chamber, they work fine for my factory colt 9mm rifle and my 1911"s. So I am thinking I either have a tight chamber in the shorty top end or I may need a tight base die for my 9mm loading which is the case for many semi auto rifles. It is often recomended to use a tight base die for reloading on semi auto rifles.
