On one of my 3's I did sand down the stock deep enough to remove the groves, very slender and nice to hold. I'll see if I can post a pic or 2. My wood was 1/2 filler, so I used bed liner on it. Still, even though without the gun mounted I could squeeze the end and see it move closer together, I have not have a problem yet. Only about 500 rounds in it so still plenty of time to prove me wrong. I just don't see where it will.
+ how/wherer did you choke the barrel? I have a loose breach, pellets keep falling out that I insert, on this one, and would like to tighten it up.