02-12-2024, 11:16 PM
You've done a lot of troubleshooting, so that's a plus.
I am not a fan of rifle length buttstocks, springs, etc. So the A5 I believe is one of those?
I had a lot of problems, twice IIRC, with rifle lengths, one of which is the 6Arc, 1 was grendel I think. I transferred that rifle length butt stock to my uintah, which is a bolt action and doesn't care about which butt stock I'm using, and no spring. Once I also tried to "shorten" a rifle length with a plastic follower behind the carbine spring in a rifle stock... no good either. For me. So I use all carbine stocks.
Yes, go to a standard carbine setup, with carbine spring, normal buffer (you will probably go to an H1 later, but for now, use normal 2.8-ish oz), carbine butt stock. For cheek risers I like the Luth-AR MBA's or the PRS lite works also, carbine style. Both are solid.
I would focus on the 105 Hdy black, as those have shot well pretty much all the time, better than 108's for a lot of guys. But either one will tell you something.
This next is purely an IMO, but for the 6 Arc and 18", I am not a fan of the +1 gas lengths, but that's what proof is using so go with it, but lighten up on the buffer/stock/spring action in the rear and see what you get. Not trying to get any debates going on gas lengths, it's what you have and proof has been able to make it work, just throwing in my 2 cents for the next barrel/upper/etc you go for. Arc is not a high-pressure (52ksi) so doesn't major on lots of gas flow/pressure, and rifle length for a 556, 18" is plenty dwell time. So go "back to carbine" for now, use a lower you have on hand maybe...
I am not a fan of rifle length buttstocks, springs, etc. So the A5 I believe is one of those?
I had a lot of problems, twice IIRC, with rifle lengths, one of which is the 6Arc, 1 was grendel I think. I transferred that rifle length butt stock to my uintah, which is a bolt action and doesn't care about which butt stock I'm using, and no spring. Once I also tried to "shorten" a rifle length with a plastic follower behind the carbine spring in a rifle stock... no good either. For me. So I use all carbine stocks.
Yes, go to a standard carbine setup, with carbine spring, normal buffer (you will probably go to an H1 later, but for now, use normal 2.8-ish oz), carbine butt stock. For cheek risers I like the Luth-AR MBA's or the PRS lite works also, carbine style. Both are solid.
I would focus on the 105 Hdy black, as those have shot well pretty much all the time, better than 108's for a lot of guys. But either one will tell you something.
This next is purely an IMO, but for the 6 Arc and 18", I am not a fan of the +1 gas lengths, but that's what proof is using so go with it, but lighten up on the buffer/stock/spring action in the rear and see what you get. Not trying to get any debates going on gas lengths, it's what you have and proof has been able to make it work, just throwing in my 2 cents for the next barrel/upper/etc you go for. Arc is not a high-pressure (52ksi) so doesn't major on lots of gas flow/pressure, and rifle length for a 556, 18" is plenty dwell time. So go "back to carbine" for now, use a lower you have on hand maybe...