Tandemkross Essential Maintenance Kit Features The Tandemkross Essential Maintenance Kit replaces some of the most commonly lost worn or broken internal parts on a Ruger Mark series pistol. The included 5-pack of rebound springs gives shooters multiple spares on hand so a single worn or lost spring never sidelines a range day. The Eagle s Talon extractor is machined from hardened tool steel with a sharpened hook that consistently grabs and ejects spent casings improving on the factory part s durability and function. An extractor spring and plunger round out the kit covering the small components that are easy to misplace during cleaning or disassembly. The Fire Starter titanium firing pin is roughly 40 percent lighter than the factory firing pin which reduces lock time for a quicker more consistent ignition while remaining highly resistant to wear and rust. Together these parts cover the upgrades and the maintenance basics a Mark series owner is most likely to need over the life of the pistol. The kit fits the Ruger Mark I Mark II Mark III Mark III 22/45 Mark III 22/45 Lite Mark IV Mark IV 22/45 and Mark IV 22/45 Tactical making it a broadly compatible option. For Ruger Mark series shooters who want to stock spares and upgrade reliability at the same time this kit keeps a favorite rimfire pistol running when it matters most. TANDEMKROSS Essential Maintenance Kit Specifications Manufacturer: TANDEMKROSS Model: Essential Maintenance Kit Compatible Hosts: Ruger Mark I Mark II Mark III Mark III 22/45 Mark III 22/45 Lite Mark IV Mark IV 22/45 Mark IV 22/45 Tactical Includes: Rebound Springs 5-Pack Eagle s Talon Extractor Titanium Firing Pin Extractor Spring and Plunger Weight: 0.3 oz Available At: GrabAGun