I used an adjustable Odin heavy AR15 buffer and a rifle length buffer spring, because that was what CSC had on the shelf when I was shooting the rifle at their range. The Odin is just slightly heavier than a H3, which is what the rifle should have come with from factory.
A couple of guys here run the Odin 9mm buffer that's up to 7.Xoz, and it worked well for them at max weight.
The heavier buffer made an enormous difference. Instead of recoiling like a 223, it's closer to a 22 mag. Doesn't beat the hell out of the rifle, and stopped all of my double feeds and stovepipe issues instantly. Still not quite as smooth on recoil as a JRC with the same ammo, but it's not far off.
A couple of guys here run the Odin 9mm buffer that's up to 7.Xoz, and it worked well for them at max weight.
The heavier buffer made an enormous difference. Instead of recoiling like a 223, it's closer to a 22 mag. Doesn't beat the hell out of the rifle, and stopped all of my double feeds and stovepipe issues instantly. Still not quite as smooth on recoil as a JRC with the same ammo, but it's not far off.