Go ahead & try it for fit. Because of the fact that Nordic pulls towards the flat "plate" where the bolts screw in, it may bottom out before catching on the M2 barrel. For most shotguns, it generally makes little difference, but the 930/590A1 barrels are substantially thicker.I have a Nordic Components barrel clamp for a 930 SPX I would like to use on my M2. The 930 has a “heavy wall barrel”. Any first hand experience as to compatibility?