6.5 Short Stroke? Update: Problem Solved

[Rusty Shackelford]

The PSA 6.5 Grendel uppers I’ve seen ship with an adjustable gas block. There has been confusion on which screw actually adjust the gas, whether side or front. If this is a factory upper sounds like you need more gas. If you assembled the upper and have a fixed gas block then I’d check the alignment or look for gas leakage around the gas key on the bolt carrier.

Thanks for the reply.
I built this one. It's a 18" PSA bbl and a BCG that I bought on this site. Standard-non-adjustable gas block. No signs of gas leakage at the gas block or key.
Gas key is tight and well staked. I'm not sure how to check gas block alignment without a borescope.
The block is in line with the gas tube straight down the bbl and into the upper. Tight up against the journal. I have always lined them up this way and never had a problem.
I've built a dozen or so uppers and lowers and never experienced this.
Gonna try the carbine lower tomorrow.
R.