The 2 screw arrangement to retain the recoil pad/butt plate arrangement has been used on the factory synthetics for decades on several brands of rifles.
Despite many deluges while hunting over the decades, I've never had water get into one of the the stocks.
I even shortened one of the old staggerfeed flatback factory synthetics well beyond the "thin plastic tubes"which were cut off and then rebuilt the arrangement using tape to hold epoxy in the "upper and lower "corners" (for lack of a better term) and coating the screws with release agent. I did have to reshape the recoil pad/butt plate on a belt sander to taper the fit to the new shorter and smaller stock profile of the carbine I had created.
As long as you didn't run the wrong size screws into the "plastic tubes" using mechanical advantage to split them then you should never have a problem.
The foam has been in use for decades as well and as far as I can tell just acts to help deaden sound and keep it from sounding like a drum.
Good luck BHJ
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