SPOTLIGHT PROJECTOR MOUNT FOR A TSMG WITH NO COMPENSATOR AND HORIZONTAL GRIP (M1).

T20 SUB-CALIBER MOUNT
BY
DON THOMAS

T20 Sub-caliber Mount. Used cal .45 sub-machine gun M1A1 with 30 round clip. Shown less stock and foregrip.

Shown here is what is described as a Sub-Caliber Mount. What this mount is for is not described. It could be a testing fixture for sight alignment after barrel replacement or training. Can anyone give a better explanation?

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