Rifle length Gas system on a carbine buffer/spring.

[wilecoyote]

I used standard and heavy carbine buffers when my Grendel has ACS, ACS-L, STR and UBR. Both worked with a rifle length gas system just fine. I switched to a rifle buffer with a PRS, but have switched to a JP Silent Capture Spring in an XLR stock. It is standard weight on the buffer and is smooth and quiet. Difference in recoil was minimal because there's not much to begin with.