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Hi Mark and welcome. A Brace can be added. A stock would require NFA registration and $200 Tax Stamp as it would then be classified an an SBR (Short Barreled Rifle). https://www.joeboboutfitters.com/SB-Tactical-MPX-Pistol-Stabilizing-Brace-p/sb-mpx-01-sb.htm ------------- cheers and stay safe!

you can add a brace with no issues. A stock would make it a NFA firearm and require paperwork and tax stamp to be lrgal