Ronancorp makes them for Colt I believe.
Little bit of UFI for those trying to replicate CAF rifles/carbines. D&H black teflon mags are the only used by the CAF. No markings other than the cage code and export only markings. I'm not sure if they're still marked export only since most mags I've used are of ban era vintage. I've seen the odd grey teflon mag with a Diemaco floor plate that I also believe are D&H.
