Our guide rod is precision CNC machined from the highest quality stainless steel and heat treated for a lifetime of usage. For a clean look, our assembly kit includes two solid stainless steel caps, (1) matte bead blast finish and (1) Black Nitride finish. The double hole design allows quick and easy spring changes, or have multiple assemblies with alternative spring weights ready to drop in for use with suppressor or different loads. Use the different colored caps as a spring weight indicator. Compatible with 1.0 & 2.0 with 4.25″ or 5″ barrel. (2) 1/16″ wrenches are included.