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It can be, the buttstock has to be filled with a heavy foam filler then the tube had to be epoxied in. The process and a Merc tube runs roughly $250 all done last I checked.
I used spray foam in a can waited till it was almost set up then slipped the merc tube in them I put the but stock back on. Done deal
$100 that's all it cost me. But that was a few years ago now