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This is the rear cylinder for the Farscape Peacekeeper Pulse Pistol Magazine. There is a recessed portion in the top of this part for a 1/4" x 3/8" cylindrical magnet to be inserted. You will need the Rear Cylinder Top to complete this sub-assembly of the magazine.
You will need this part plus the Front Cylinder, Rear Cylinder Top, and Mag Base to complete the magazine.