Four examples of AK47 receiver styles, side by side. An unbent flat, a Bent Flat (no rails or cross support), a finished receiver and an 80% (or so) blank with the shape, but no holes, dents or rails

These three represent three stages in the creation of an AK47 receiver on the left is the flat with holes and dimples (dents) all in place , A bent flat that has the general shape of an AK47, but it needs a few final parts and a finished receiver as an example

These blanks come with a pattern glued to them so you'll know where to drill the holes.. the dimples and various dents in a normal receiver? Well those are not very easy at all with these 80% receivers

While the plans are attached, they just need to move a little bit to be useless, so be sure they are secured well These blanks are also much longer than an AK47 receiver

Flats have all the dimples and holes in place, but they need to be folded (bent) and the internal rails need to be installed (with a spot welder ideally) also these need to be hardened. While hardening a receiver can be done with a torch, the pros send them to large heat treating facilities to ensue the receivers don't twist or change shape during the process