These are 3D printable S&W M&P15-22 magazines. Starting from The Fair Deal magazine by General Custer, I've modeled these as close to a 1:1 as possible of the original.
I have only tested the rectangular springs as of the time of release. The spring dimensions are in the images folder. They're slightly thicker than OEM S&W mags but it was the only listing I could find on AliExpress with the closest dimensions to the S&W versions. If its too much pressure, clip one or two loops. Black Dog Machine springs should be compatible and I've included the followers for them, should you wish to use those instead.
Big thanks to BLC and General Custer for the base design.
LBRY Tags: ar22; 15-22; magazine; 22lr; 3d2a