that's the stuff I am needing to familiarize myself with, don't want a rifle that is hard to find readily available mags for.........the National Match ARmalite does look & sound like a dandy!!!!
The "B" model is extremely easy to find mags for. I have (1) 10 rounder (1) 5 (2) 25 (20) 20's. I bought all of these from a variety of vendors over the years but the bulk of the 20's came from ARmalite in bulk pack sales specials. Terribly easy to find and buy. ARmalite made the change since they were losing a few sales over some keyboard bullies raising hell over it. Not sure why anyone would want a 19 round DPMS mag in their ARmalite but whatever. I do get the Magpul fad but have never handle one of their 308 mags.
Glock has had their propitiatory design on mags and has had no bitch back about them at $20 a pop. The ARmalite mags are $25 a pop and are four times the size and all metal lol. Amazing to me what grown men will whine and moan about
If it gets to you that much the "A" model has the design to take all of the other mags. Its just a matter of choice.
Read up for yourself AR-10® 20-round GEN II magazine 5 pack