it's probably an echo from the battery compartment in the back of the stock, though the mid and front of it has lots of voids inside... you can try dynamat... that stuff they use in cars to dampen stereo vibrations and road noise, but you have to get inside to lay it and stick it.
For the front of the stock, take it all apart and pump it full of spray foam maybe.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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