Got an old Sten mag kicking around you wish you could use for something, well fire up your printer and make yourself a Sten mag fed AR9. Maybe you purchased a PPS43 kit that came with mags but figured out far too late that you cant weld. well you can now put those mags to good use in a custom PPS43 mag fed AR9. Or just maybe you long for a MP5 but cant afford to even look at the kits, let alone buy one, don't worry, cause now you can LARP around your living room with a bootleg mp5 mag fed AR9. Vityaz, Evo, M3 Grease gun, colt, the options are endless. (options subject to ending.)