Possibly non-permanent Loctite if you want to unscrew them somewhere down the track ?
( Disclaimer - never done this myself, just thinking aloud here )
One thing I have done once or twice on a wooden stock is packed the screw holes with some dense wood shavings so the studs took more effort to screw in. That worked quite well. Not sure if a similar approach would work for plastic stocks. Depends on what material the holes are formed with I guess.
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