12-13-2022, 11:49 PM
What does it do with factory 105's and/or 108's?
I have/have had 4, 6Arc barrels (still have 3, 16, 18, 20 and bolt-action) and none of them have this issue. All shoot 90, 100, 103, 105 and 108's. Basically (and I am not an expert here) I'd say undergassed or over-buffered or under powdered. Pardon the grammar. You don't say what stock/spring/buffer you're using. A rifle stock setup, IMO is a no-no, no matter what it does for other calibers. I stay with carbine systems.
I did have 2 223-wylde barrels that I had to enlarge the port on, and now they run fine.
There are a couple of tricks you'd want to do if you go that route.
But first, before you mod the barrel, I would contact Mark back at precision firearms to see what he thinks, he's busy but reliable and might have some ideas for you, even take it back to look at maybe.
I have/have had 4, 6Arc barrels (still have 3, 16, 18, 20 and bolt-action) and none of them have this issue. All shoot 90, 100, 103, 105 and 108's. Basically (and I am not an expert here) I'd say undergassed or over-buffered or under powdered. Pardon the grammar. You don't say what stock/spring/buffer you're using. A rifle stock setup, IMO is a no-no, no matter what it does for other calibers. I stay with carbine systems.
I did have 2 223-wylde barrels that I had to enlarge the port on, and now they run fine.
There are a couple of tricks you'd want to do if you go that route.
But first, before you mod the barrel, I would contact Mark back at precision firearms to see what he thinks, he's busy but reliable and might have some ideas for you, even take it back to look at maybe.