Radian Glock 19 Compressor Quick Tune Guide Rod Kit Enter the screwless design of the Compressor Quick-Tune Guide Rod, with a dovetail interface captured by the spring, creating a simple and secure lock-up. Most adjustable guide rods on the market use a cap screw to retain the spring. The problem? Loose screws are too common and thread locker forces you to commit to one spring weight. Enter the screwless design of the Compressor Quick-Tune Guide Rod. The dovetail interface is captured by the spring, creating a simple and secure lock-up. Flutes along the guide rod allow the spring to move with less friction for smoother cycling. The heat treated guide rod has a slick, durable, and corrosion-resistant Nitride finish. Includes: A hardened 17-4 SS Guide Rod Three flat wire Springs in 13lb, 15lb, and 18lb weights One stainless steel washer for Gen 3 One stainless steel captive bushing for Gen 4 & Gen 5 compatibility A spring compression tool Compatible with all generations of Glock 19 as well as Glock 19X and Glock 45.