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Super easy to make, get some thick rubber or neoprene about 1/8 thick or more and a 1/4"hollow punch, cut the rubber to just under 1 1/4 square and punch the holes for the guide rods, the springs keep the rubber from sliding foreward.
I've thought about this myself. I make my own buffers for SKS. They do reduce a little recoil and certainly stop the metal to metal contact. I should widdle one up for the AR180B to see what if it helps with any thing. Might end up just taking up rearward clearince for the bolt and cause misfeeds though...