Help ID Mystery Mag 9MM?

[RCEMERalf]

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.

Information

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[browningautorifle]

Is it a Taurus PT99? They look like and almost interchange with a Beretta 92/96 and they will fit into the mag well of a hi-power. The top rear is correct and the look and length is too. Lock notches are right.

[Maple_Leaf_Eh]

I've got one in my IPSC bag to single load the first round in my Browning HP. Then I load the full magazine underneith. (My instructor had a runaway gun on a load. Everyone got really excited at that.) It is commercial from US somewhere, but I forget the maker.

[RCEMERalf]

Thanks guys. Found a Ram Line Taurus PT99, PT92 mag on Gunbroker, item 331672944. It has the mag spring rivet and all, however the retainer slot is wider than that on mine. May not make any difference. Beretta PT99, 92FS also looks very similar with the narrow retainer slots. I will take it to a show and see if someone will confirm a fit. Regards.