After considering everybody's feedback regarding jigs, we were able to develop our patent pending Ultimate Jig. With this jig, you are now able to build both AR-10 and AR-15 80% lowers. Our alignment tool that ensures the pocket is always centered in combination with our oversized top plates allows for very smooth and consistent finishing. Pair that with our press fit stainless steel drill bushings and included depth gage, you will have yourself the perfect tool to finish any top-tier AR rifle. Designed to be used in conjection with The Ultimate Jig Tooling Kit 100-022-573. Mfg: Juggernaut Tactical