Sort 2A/B The very first milled receiver made from steel forging. It went into generation in 1951 and production ended in 1957. The Type 2A has a particular socketed metal "boot" connecting the butt stock towards the receiver as well as the milled lightening cut on the sides operates parallel https://mariogdyfo.blogoscience.com/21516618/rumored-buzz-on-ak-47-rifles