Rugers PC Carbine rifle features interchangeable magazine wells for use of common Ruger and Glock magazines. Its Dead blow action features a custom tungsten dead blow weight that shortens bolt travel and reduces felt recoil and muzzle rise. The cold hammerforged chromemoly steel barrel is also heavy contoured with fluting. The durable glassfilled nylon synthetic stock features sling swivel studs soft rubber buttpad with spacers and the grip has a proprietary texture for enhanced control. Its CNCmilled aerospacegrade 7075T6 aluminum billet receiver includes an integrated Picatinny rail and adjustable ghost ring rear and blade front sights. The PC Carbine also has a light crisp trigger pull and ambidextrous controls. This model has 1228 threads along with an included thread protector. It ships with SRSeries Pistol and Security9 magazine well installed and includes an additional magazine well accepting Glock magazines. NOTE Older Glock magazines that feature only one magazine latch slot may still be used with the PC Carbine but the magazine release button must remain on the left side of the rifle as shipped from the factory as the magazine will not properly lock into the magazine well."