My local gun shop recently got in a Johnson Arms m1 carbine chambered in 5.7 MMJ (.22 spitifre). It's in good condition but I, nor they, have any idea of its value. Ive attached a picture of the receiver and a video talking about. I was able to find some wartime carbines converted to 5.7 mmj but none that were produced by Melvin Maynard Johnson and Johnson Arms. How rare is this rifle and does anyone know it's value?