I am looking to identify this magazine. 9 MM fits well. Has unusual spring that is a band, rivetted to the top right of the mag mouth. It is coiled below the follower, transverse to the cartridge feed direction. Looks like the follower has a metal insert on the bottom for the spring to rotate against. A bit longer than the Browning HP pictured for comparison. Mystery mag on the top or left has two thin retainer slots. Nicely blued as if commercial. Could be smg as I have a longer one as well. Thanks for any help.
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