Radian Weapons, Compressor, Guide Rod, Nitride Finish, Black, For Glock 19 Gen 1-5 WARNING Warning WARNING WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. Screwless Design For GLOCK G19 GEN1-5, G19X, and G45 13, 15, 18LB Springs included Product Description 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.