I bought the 92FS because I like the feel of steel - no plastic pistols for me thanks. Imagine my surprise when I found the recoil guide was made of some sort of plastic. I found the Buffer Technology 92FS recoil buffer was made of steel and included a buffer to soften the (tiny) recoil of the 9mm pistol.
I took the Beretta out today to run some punishment though it. No gun is trusted by me until it runs the gauntlet. For a rifle that's 500 rounds, for a pistol that's 200 without a hitch. I ran some crap TRW 115 gn. round nose that my Smith and Wesson 5904 refuses to fire two rounds in a row with. Using four 15 round magazines I ran 60 rounds though the pistol as fast as I could swap magazines - by the last magazine the heat was pouring off the top of the pistol. I set the pistol down and my wife and I reloaded the magazines and ran them though twice more and then the last 20 rounds for 200 rounds put down range in about five minutes total.
The recoil guide did function without a hitch. It does seem to soften the slam at the very end of recoil using a rubber tube around the steel guide.
$25 retail available from Brownell's item 071-000-018