04-17-2020, 08:13 PM
Having an adjustable stock sounds like it is actually a carbine stock -- which is ok but if so, then it means you have a carbine length buffer tube, and you need to have the carbine spring and a carbine buffer weight as well. If you say "whatever is standard for a mil-spec 556 tube" this also sounds to me like it is carbine length (the carbine system has both mil spec and commercial spec buffer tubes), so verify which type of stock length you have. Could be you have mistakenly put in a rifle spring, maybe a rifle buffer weight also...
So. If it indeed is carbine length stock then which spring exactly is in there and which weight of carbine buffer do you have, perhaps you can go to a lighter weight buffer (really shouldn't need this since factory ammo cycles...)... admittedly I am not a buffer weight expert.
Now as an extra thought, a "mid-length" gas system should be giving lots and lots of pressure and dwell time (maybe even too much dwell but again, not an expert there)... since most 20" barrels are rifle length. Perhaps double check that also.
So. If it indeed is carbine length stock then which spring exactly is in there and which weight of carbine buffer do you have, perhaps you can go to a lighter weight buffer (really shouldn't need this since factory ammo cycles...)... admittedly I am not a buffer weight expert.
Now as an extra thought, a "mid-length" gas system should be giving lots and lots of pressure and dwell time (maybe even too much dwell but again, not an expert there)... since most 20" barrels are rifle length. Perhaps double check that also.
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