Surefeed by Okay Industries ... aluminum bodied GI type mags PTFE coated with anti-tilt followers. Okay Industries has had military contracts from years.
https://www.botach.com/okay-surefeed-5-56mm-20rd-magazines-black/
Damnit, I want one of the AT4 tubes...lolStill running 3 ea USGI 20 rd mags down range (2 Colts and 1 Adventure Line). These were built well before 1971 when the last contract was given out for them. Never had an issue with them.
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