This is a Sten mk5 kit that someone did with an Indianapolis arms semi auto bolt, there are two extra springs and an extra firing pin for the semi auto bolt, there’s also some original parts that come with it, I’m including a couple of print outs for the original tube cut outs. I have not shot this but I did cycle one primed brass from the magazine to the chamber, it fired and ejected when I pulled the bolt back, I have no idea how this thing will run and recommend taking it to a competent gunsmith and having it check out. I can meet during daylight along the Gulf Frwy. At Academy or Cabelas. Text if you want more information. Two eight 1 330-nine five 66