Guess you missed this (and the photograph)
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Quote:
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The receiver extension on the 15-22 rifle is molded as part of the lower receiver itself and is not a screw in part like the 5.565mm version.
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A "stripped" lower is still a rifle and you can't legally make a rifle into a pistol that I know of. You can, of course, make it into a SBR with the proper paperwork and tax stamp.
-- Chuck