01-27-2023, 12:33 PM
Thanks everyone for the tips and suggestions. Here's what I have determined so far.
Changing to a carbine lower with standard weight buffer improved functioning to almost 100%. Only one mag out of the 5 that I tried failed to chamber a round and lock back on the last round. I put it aside for now. My remaining mags ran perfectly.
So, it appears the rifle buffer and spring were too heavy for this rifle. That does not mean it is the only possibility.
The problem may still be in the gas system since I have built rifle length uppers before and they ran fine on this A-2 stocked lower.
Further testing will continue after I get my hands on a bore scope and take a look at the gas port and block alignment.
Also, can anyone tell me where I can find out the proper gas port size for rifle length gas for 6.5 Grendel? If my port is under-sized, as some have suggested, that my be the answer.
Thanks, R.
Changing to a carbine lower with standard weight buffer improved functioning to almost 100%. Only one mag out of the 5 that I tried failed to chamber a round and lock back on the last round. I put it aside for now. My remaining mags ran perfectly.
So, it appears the rifle buffer and spring were too heavy for this rifle. That does not mean it is the only possibility.
The problem may still be in the gas system since I have built rifle length uppers before and they ran fine on this A-2 stocked lower.
Further testing will continue after I get my hands on a bore scope and take a look at the gas port and block alignment.
Also, can anyone tell me where I can find out the proper gas port size for rifle length gas for 6.5 Grendel? If my port is under-sized, as some have suggested, that my be the answer.
Thanks, R.