The brass tube is slipped over two sections of 7/16 barrel. One barrel is smooth bore and the other is rifled. The rifled section is about 2" long. The compression rings secure the brass tube to the barrels making a tight fit and keep the barrels centered (concentric).
The Mak slide is removed by pulling the slide back (hold it), lower the trigger guard, lift up on the rear of the slide then slide forward all the while holding the trigger guard down.
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