This is the most reliable 3D printed trigger set works as both open & closed bolt (used on AUG & P90), great for projects or replicas. !!!Note: I'm always open for suggestion and help on improving the design and proof of concept. ##I have also made a group of firearm designers and gunsmiths on KEYBASE that consists of over 77 highly skilled gentlemen, so please feel free to join our group and ask any questions (gun_cad_ideas) !Don't forget to check out my other Cool designs and Follow my Weekly dose of KooKoo uploads, Enjoy ;)