I saw this on Youtube a few years back and I had to make my own Bada$$ version, its a PROP of the straight pull HS Blaster chambered in 300 Blackout, now i had to modify the upper and lower so they are EU Legal which means that non of the AR components fit in them, please don't modify this to fire real ammo as it will be extremely dangerous, Good luck and happy printing ;) https://www.youtube.com/watch?v=9-dTeCOjc6Y&ab_channel=MussyDesign https://www.youtube.com/watch?v=6rXNj--eBeA&feature=youtu.be https://www.youtube.com/watch?v=byvITW5ZIqY&ab_channel=DurayEnterprisesLLC ##Loads of accessories for this beauty will be coming very soon ###As usual all building details will be in the make. If you are interested in other firearm parts and designs do join our group on keybase: Gun_Cad_Ideas. https://keybase.io/team/gun_cad_ideas !!!Note: I'm always open for suggestion and help on improving the design and proof of concept. !Don't forget to check out my other Cool designs and Follow my Weekly dose of KooKoo uploads, Enjoy ;)