A Wilson Shok-Buff is 3mm in thickness….When it is struck, it compresses to ½ its diameter. So, what we are talking about is 1.5 mm in thickness to disrupt the cycling action in a 5” full-size 1911….If your pistol is so acutely tuned that this distance would disrupt your firing action; I contend you have other problems.
1.5mm can be significant. Look at the amount a typical pistol slide moves beyond the bare minimum for the next round to pop up. Then get an AK type rifle and compare. Now see which one is more tolerant of limp-wristing, dirt, etc, and
especially which one will tolerate weak magazine springs. 9 times out of 10, jams with a pistol are caused by the magazine. Weapons with very excessive bolt travel, on the other hand, tend to be almost impossible to jam.
1.5 mm could
easily be 25% or more of the slide's travel beyond what's strictly necessary for the next round to feed.
Also, this is a video worth watching.
http://www.youtube.com/watch?v=_sNDTdKQNVU
It's pretty obvious that Mikhail Kalashnikov is not an idiot. He did not design a gun which has a "violent" action, that "requires" the use of a recoil buffer to prevent wear. For about half of those shots, the bolt carrier didn't even hit anything.
Once again, you should use ammo that's appropriately powered to your weapon platform. The AKM is obviously tuned
quite well to standard military 7.62x39mm ammo. If your weapon requires a spring that causes lockup battering, or a recoil buffer, to prevent premature wear, then you're obviously using ammo which is far too strong for it (regardless of whether the gun factory made it that way). Unless the gun is
designed to use a recoil buffer (like the AR-15). That's a whole different story.