I don't know if the question should be here or in GUNSMITHING. Does anyone have any idea on the original, new length of the various springs used in the REISING M-50/55 subguns? Better yet, does anyone know of a source of new Reising springs? Ya' can find Thompson springs, ya' can find M-3 springs and Sten, etc but there seem to be no surplus Reising springs out there.