08-14-2018, 07:23 PM
Just noticed you said it's a 24 inch brownells/Saturn grendel II.
What ammo?
I had one when I first got into the grendel got it here as a complete rifle but guy I got it from had it cut back to 21 inch.
It would show deep fireing pin marks on fired brass and I had several blown primers useing hornady sst ammo.
Had to use a adjustable gas block and tune it down because it was so over gassed due to extra large gas port hole in the barrel, once I tuned it the issue went away.
Not saying that's what's happening here but just more food for thought for you sir.
What ammo?
I had one when I first got into the grendel got it here as a complete rifle but guy I got it from had it cut back to 21 inch.
It would show deep fireing pin marks on fired brass and I had several blown primers useing hornady sst ammo.
Had to use a adjustable gas block and tune it down because it was so over gassed due to extra large gas port hole in the barrel, once I tuned it the issue went away.
Not saying that's what's happening here but just more food for thought for you sir.