T91 Failure to Feed

[wau52]

I have a 16" Wolf A1 upper that is having issues feeding the next round. It ejects reliability but will not reliability feed subsequent rounds. I've shot about a hundred rounds of mixed AE 5.56 and Taiwanese Wolf Gold .223. I did have a T91 gas block installed by a gunsmith (maybe the cause of the issue?). I'm using an Anderson lower with the buffer and spring below (carbine buffer tube):

Counter-Tilt H2 - 4.5oz Buffer & Chrome Silicon Carbine Buffer
https://d2j6dbq0eux0bg.cloudfront.net/images/11643286/2789925375.jpg

I can also upload a video of me shooting the rifle if that would help.

[e292644]

Check your shell ejection pattern and it can tell if you are overgassed or short stroke.

AR15-ejection-pattern-demonstrated.jpeg

[wau52]

I believe it is short stroking, see video in link below:

https://1drv.ms/v/s!Ai17qYo1S_FVkhU--20L0XQ0uwOw

[e292644]

In that case, you may want to port the gas port one size large.

[wau52]

Recommendation on the best way to do that? The only piston operated system I've modified is the gas port on a Mini-14.