I saw a Cobray Mac 11 9mm for sale at a gun show, the owner said it was semi-automatic and fired from an open bolt. It also had a metal stock, thin metal rods that slid into a closed position or locked open. Like the MAC 10 they are made of a formed sheet metal lower receiver containing the trigger mechanism and square tube upper receiver, housing the barrel and bolt assembly. The barrel is 5.4” in length and have a thread size of ¾ x 10 for any accessories you may want.
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