Might also find that an upgraded recoil spring in a stock GBB will absorb more of the rearward force of the "kickback", reducing the rearward wear on the slide, but will make the slide ram into battery faster. I have a stock KSC G19 that the only upgrade (ok, I installed a threaded outer barrel on it yesterday) is the used Guarder enhanced recoil spring from my upgraded G19 (put a fresh on in), and it cycles real fast now. Something to consider, not saying it is proven to work on stock guns and keep them safe from propane, just a heads up on a cheap add on you can do to dampen the extra power.
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