If your carbine doesn't have any of those three exclusive parts, don't worry about it. And you have to have ALL of them to constitute an "M2 kit" which is a machinegun in and by itself, whether you have an M1 carbine or not. Note that ALL of those six parts are needed to convert an M1 carbine to selective fire. Many M1 carbines sold through DCM and CMP had or have M2 slides and M2 sears, as well as M2 trigger housings. The M2 hammer will work in an M1 with a shim. The three parts that are exclusive to selective fire and have no place in a semi-auto are the disconnector, disconnector lever, and selector. Note that the M2 trigger housing, M2 stock, round bolt, and small parts (springs) are NOT included. They are: 1) M2 hammer, 2) M2 sear, 3) disconnector, 4) disconnector lever, 5) selector, and 6) M2 slide (cut out on right side to operate the disconnector lever). The lead time required to have the bolts ready for assembly into a carbine varied from one manufacturer to the next. Many years ago, the (then) ATTD (now BATFE) listed the six parts they considered necessary to either convert an M1 carbine to selective fire or that in themselves constitute a machinegun within the meaning of the term in the National Firearms Act. During the month of November 1943 (when these particular bolt changes were standardized) M1 Carbine production peaked with 528,765 M1 Carbines manufactured by nine prime contractors at ten separate facilities.
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