Says 12 rds on it, but only really holds 11,
for a double-stack .45acp, not sure which one.

Wondering if it was a cut-down 15-rd?
Possibly to conform to a mag limit in some state?

Sound familiar to anyone??

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Marlin & Calico Specialist

I have no recall of a double stack 3rd gen in .45. Are you sure that this is really a mag for an S&W?

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NHI, 10-8.

What identifies it as a S&W factory magazine to you?

I'd not heard of any double stack 12rd .45's being produced by S&W before they designed the M&P 45.

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Ret LE Firearms inst & armorer

The SW99 was also available in .45 but not in a 12 round magazine. The SW99 in .40 had 12 shot magazines.

Can you post pictures?

Aha, it's not an S&W mag...
Para-Ord seems to be the maker.

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Marlin & Calico Specialist

You're right. I was thinking 12rd .45's but didn't type it fully in my previous post. I corrected it. Thanks

FWIW, as I recall S&W received the SW9945 mags from Walther (made by Mec-Gar), while their M&P 45 mags are being made in the US (and their M&P 9/.40/.357 mags are being made in Europe).

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Ret LE Firearms inst & armorer