I was thinking rubber vs g10. I'm not that worried about the texture.I have them on a TRR8 and shoot plenty of 357 with no problem. But that 340 is a completely different beast. They do make the same grip without the checkering.
I haven't tried them but like how they look. I'm wondering how they feel after a few cylinders of .357mag. I still have the stock grips on mine.
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I put a set of Uncle Mikes combats on my M&P340. They are way more comfortable than the factory grips. This is on my carry piece and the Mikes grips don't print any more than the factory boot grips. An even more cushioning grip is the Pachmayer Compac's. Smaller than the Uncle Mikes but not as much to grab onto. Pic below is the Uncle Mikes. I have Uncle Mikes on all my round butt pistols.