The kynshot hydraulic guide rod is designed and optimized to be a drop-in replacement for all guide rod assemblies used for the glock 19 slide or alike, without having to change the configuration of current firearm.The innovative design, uses a unique damping configuration to allow the slide to cycle properly, controlling the overall movement and speed of the slide.The kynshot guide rod can be used with all different ammunition scenarios.The pb6003 reduces the total recoil motion over 70%.The test data shows that when using the kynshot pb6003, the recovery time per shot is less than 0.5 seconds, whereas other guide rod systems recovery time show a 1.5+ second recovery time or moreMaterial: Stainless Steel