I had some of the Fed Ord in 20's and 30', Also some PMI 20's that all worked great in my pre 580 mini 14's. I have some "American" made 10's, that was the manufacturer i believe between Fed Ord and PMI. I don't know if it was a business name change, or someone taking over the Fed Ord Company, but yeah, "American" brand mags are also great. There are no markings on the mags to identify them, but i have one or 2 "American" mags still in the original packaging, and they look just like Fed Ords.There were never any better mags than those from Federal Ordnance (Precision Magazines Inc aka PMI). Both the 30's and 40's would function perfectly. They made 20's but I never had any. I still have a dozen of these mags and no reason to buy anything else. Did anyone ever pick up the tooling and make these mags again?
I used the same pouches to adapt the MOLLE II frag pouches for use with M1 Garand en-bloc clips.If you do use the 10 rounders, an M67 Grenade Pouch that you can get on Amazon in several different styles will hold two of them.