Colt mags for M4 contract

https://aais.ria.army.mil/aais/award_web_07/W52H0907D04250040/000000.pdf

Above is one of the many contract increments for Colt M4/M4A1’s. It says that “additional magazines are priced at $56.84 per set of six”.

I’m guessing that Colt merely contracts these mags from a third party vendor and includes them in the weapons shipments. Anyone know if these are stamped with Colt’s markings or another manufacturer?

We had a lot of OKay mags. NHMTG is another.

The mag floor plate is stamped with the Colt pony and Colt lettering. I have been issued these on occasion, but the Okay’s seem more common.