Rhineland,
I know there are people who don't like ProMag but the fact is that they are building hi-cap mags for the 22 magnum and the 17 HMR. One mag design is a 25 round mag and the other one is a 50 round drum. ProMag is building the drums for 22lr, 22 magnum and, I hope, for the 17 HMR.
The 22 magnum drum is on the right!
It would be great if you could get the R22 to run 100% on the 22lr drum and maybe build a 22 magnum/17 HMR rifle that could operate useing either the 25 round mag or the 50 round drum! I want the AR-57 upper but the ammo is still expensive with no real change in sight. I figured a good alternative would be a 22 magnum or 17 HMR. They could use the Ruger mags, the 25 round mags or the 50 round drums. At this point in time the 22 magnum ammo is less than half the cost of the FN ammo.
Any thoughts on this?