I remixed the "Foldie McGrippins" by FFFTech/FFFTechnology because I could never get the printable spring to work, which is probably on me. I decided to redesign it to be skeletonized and to use a removable pin that is inserted between the upper and lower grip, locking it into place. The pin is retained by 550 paracord, so you don’t have to fear losing it LBRY Tags: guns; 3d printing; fosscad; ar grip; ar-15