Originally Posted by colt_saa

No hush hush deal, MecGar has been the OEM for most Smith and Wesson magazines for many, many years

The OEM magazines are clearly on display in MecGar's booth at the annual Shooting, Hunting and Outdoor Trade show.

Are you looking for other OEMs?

Checkmate manufactures OEM magazines for Beretta and SIG,
OKay was an OEM Supplier to Colt
Shooting Star was also a Colt OEM supplier
MetalForm manufactures OEM 1911 magazines for lots of companies. Detonics and Colt come to mind

There are lots more examples