If your shotgun uses the same attachment pattern as the standard Mossberg 500, then it should work, but is not a guarantee.
The answer ‘gear expert’ Ben, is yes, yes it will fit the Shockwave. HOWEVER, you would need an approved Form 1 from ATF, since that would create a short-barreled shotgun (barrel less than 18”). I would also like an answer to this question, regarding whether the buttstock is removable, and also whether the buffer tube is removable, to either whittle this down to breacher grip size, add a folding hinge (must still keep her over the 26” OAL, when folded).