My concern was with the conversion kit itself. I know the carbine M2 kit has been ruled a machinegun of and by itself whether or not it is anywhere near a carbine.
If a .22 conversion kit will function FA only when installed in a selective fire rifle, it would be an accessory. But if it makes a semi-auto into a FA or selective fire rifle, I would think BATFE would call it an MG in itself.
Jim
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