A TM-1 stock will bolt on to a TMX, but the comb will be way to low for the high rib on the TMX. Sometimes I use an adjustable comb TM-1 stock on my TMX by using longer pins. This leaves a wide space between stock and comb but doesn't seem to effect function other than cosmetics. There are several gunsmiths on trapshooters.com that can tighten your TMX for you. Hope this helps.