A thing I struggle with is the balance between cost and training. 22lr is really good for some things. Gun handling, transitions practice, ready-ups, long-range-at-short-range, etc. I spend a large part of my year shooting 22lr with the kids on a regular basis. A hundred rounds of 22lr is a bit over five bucks (at current prices). A hundred rounds of 223 is more like $25 (if I reload it).

I shoot a fair bit of outlaw falling steel, and a gun with a reliable high-cap magazine would be terrifically useful for that. Given that I have an M4-22 Elite, being able to use my mags with it would also be great. Enter the Tippmann M4-22 RCR.