The Polymer80 RJ556U jig is a tool designed for use with the PF940C and PF940v2 frames, which are 80% lower receivers for the AR-15 platform. 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 RJ556U 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 hardened steel drill bushing and alignment pins, ensuring proper alignment of the drill bit and frame. The RJ556U jig is compatible with both full-size and compact frames and is designed to work with standard AR-15 lower parts kits. (All pricing is as of date of publication. JigInstructions.com provides this information and these links for informational purposes only. There is no guarantee of the accuracy of the prices listed below.)
Polymer80 RJ556U – Universal 80 Lower Jig for Mil-spec AR-15 80% Lower Receivers (gunbuilders.com) – $79.99
Polymer80 – P80-RJ556U – Big Country Sporting Goods – $44.92