Standard carbine buffer. 3.0 oz.
H1 buffer. 3.9 oz.
H2 buffer. 4.8 oz.
I've tried all of them. By swapping out buffers, you're taking the easiest route to adjust the cyclic rate of your rifle. The same can be accomplished by swapping out the recoil spring or the semi-auto bolt for a heavier full auto bolt.
In my experience (YMMV) of the three standard type buffers, the H1 is the one that smooths out the perceived recoil without causing cycling issues with common 223 FMJ's. The H2 can cause some issues with the cheapest plinking 223 ammo.
The buffer I prefer to use is the AR-Restor hydraulic buffer.
There is an old thread where I bought it, passed it around to forum members to try out, and it returned to me. The consensus is that the hydraulic buffer didn't just slow down the cyclic rate of the rifle, it did so in a progressive manner, smoothing out perceived recoil. With the hydraulic buffer installed, my 15-Sport has cycled everything from my handloads, relatively cheap FMJ's, 5.56's, and premium target ammo.
It's your rifle. Swap out whatever you want on it. If it don't work out, then put back in the original parts. No blood, no foul.
