Check these out. Identical interchangeable 30-round mags, 22WMR out of a pistol or carbine. The pistol is the size and half the weight of a Glock 19. The carbine weighs like half an AR. As fast as you can pull the trigger, 30X 22WMR.
Kel-Tec PMR pistol, 90 rounds in 30 seconds. Zeri recoil. Virtually point of aim to 200 yards.
https://www.youtube.com/watch?v=A2KZMI-qNvY
Shooting the Kel-Tec CMR-30 Lightweight 22 Magnum Semi-Automatic Carbine - Gunblast.com
Skip ahead to 9:30, or watch it all.
https://www.youtube.com/watch?v=ry89JDxzItA
They take the same mag. 22WMR. Nasty. No recoil. Accurate. Flat shooting.
That PMR 30 has been on my radar for a long time. I have watched the reliability improve as exhibited by reviews. My best buddy just bought one and I am anticipating his feedback.