ricsmall Wrote:If youre running a 20 Im assuming it has rifle length gas? If so I would use an H2 or H3 buffer, whichever weighs the same as a rifle buffer. IIRC, a rifle buffer is 5.2 oz. it makes a difference. I would adjust my gas after installing the new buffer. Theres a reason rifle length gas systems use a rifle weight buffer. Just my $.02. Hope this helps.
Rifle length buffer tubes have rifle length buffers. The Vltor A5 Recoil System mimics the the rifle length recoil system for carbine rifles.. The Vltor A5 recoil system has much more recoil impulse than my standard buffer tube with a JP SCS and no tungsten weights. These are in 5.56 cambering. The Grendel may need a heavier buffer, but not always..
It has been my experience, "to reduce recoil" the lightest buffer used with mitigated gas results in the lightest recoil. The advantage of an adjustable gas block is the ability to adjust the ammunition to the rifle. If possible, I would test both buffers, "at optimum gas setting" to find the sweet spot with reliability..
Recoil spring strength and manufacturer can also make a difference. For a standard carbine spring, the length should be between 10 1/16 to 11 1/2 inches long.