The Polymer80 PF45 jig is a tool designed for use with the PF45 frame, which is an 80% lower receiver for the full-size Glock 20 and 21 handguns. The jig is used to guide the user in drilling and milling the necessary holes and pockets to complete the frame and turn it into a functional firearm. The PF45 jig includes all the necessary drilling and milling templates, as well as instructions, to ensure the frame is completed correctly and safely. The jig is made of high-strength polymer and is reusable for multiple builds. It features an integrated drill guide and depth stop, making it easier to achieve precise cuts and holes. Additionally, the jig includes a front and rear steel rail system, ensuring proper alignment of the slide and barrel. The PF45 jig is designed to work with standard Glock 20 and 21 parts, and is compatible with Glock factory and aftermarket magazines. The jig also features a locking block rail system, which provides additional support for the slide and improves accuracy.