.17-VS-.22WMR

THIS IS MY QUESTION...THINKING ABOUT CONVERTING A AMT AUTOMAG TO .17 RIM. WHAT IS THE WORKING CUP. FOR THE .22WMR AND THE .17 RIMFIRE?
WOULD'NT IT BE A NEAT GUN? NO MAG CHANGE OR SLIDE MODS...JUST BARREL.



***********ITS A SMALL WORLD..BUT I DON'T WANT TO PAINT IT***********