Issues with new build...

[BCHunter]

BA grendel barrels generally have smaller gas ports, then other manufactures. The 16" Hanson profile barrel I did had intermitant cycling issues, would feed the mag but not lock back last round. I was able to resolve it by polishing bcg and inside of upper. And a few more rounds of break in. My next step would of been drilling out gas port, believe mine was around .680"