The Ruger Mark IV 22/45 Lite Model 43916 is a Davidson’s Distributor Exclusive .22 LR rimfire pistol with an OD Green anodized aluminum receiver, 1911-style grip angle, lightweight Lite-series upper, and a 4.40 inch threaded barrel. It combines the easy takedown design of the Mark IV series with the familiar 22/45 grip frame and a suppressor-ready 1/2"-28 muzzle thread pattern.
Ruger designed the Mark IV platform around simple, one-button takedown. Pressing the button at the rear of the frame allows the barrel-receiver assembly to tilt up and off the grip frame without tools, making field stripping and proper chamber-to-muzzle cleaning much easier than earlier Ruger rimfire pistol designs.
Lite-Series Threaded Barrel: The Mark IV 22/45 Lite uses a lightweight, ventilated, aerospace-grade aluminum receiver and a tensioned stainless steel barrel. Ruger lists this model with a 4.40 inch threaded barrel and 1/2"-28 thread pattern, allowing installation of compatible muzzle accessories where legal.
22/45 Grip Frame: The polymer 22/45 grip frame gives the pistol a 1911-style grip angle and uses checkered 1911-style grip panels. Ruger lists the grip frame as precision molded polymer with a serrated frontstrap and checkered backstrap for a secure, comfortable hold.
Rimfire Accuracy Features: Ruger’s internal cylindrical bolt construction keeps the sights aligned with the barrel-receiver assembly, helping maintain sight-to-barrel alignment. The cold hammer-forged barrel provides precise rifling for accuracy and long service life.
Optics and Sights: This model includes a fixed front sight, adjustable rear sight, and a factory-installed Picatinny rail for mounting compatible optics. That gives the shooter both traditional iron sights and an easy path to a red dot or other rimfire optic.
Controls and Magazines: The Mark IV 22/45 Lite includes an ambidextrous manual safety that can be converted to left-side-only operation using the included washer. Ruger also lists a push-button magazine release, drop-free magazine function, magazine disconnect, and two 10-round magazines included.
Important Firearm Note: Firearms must ship to a licensed FFL dealer where required. Confirm local laws, magazine capacity restrictions, threaded-barrel restrictions, suppressor or muzzle accessory laws, and all federal, state, and local requirements before purchase.
Related Gear: Browse more Ruger products, shop additional .22 LR Ammo, view compatible red-dots, or browse silencers and rimfire suppressor-ready accessories where legal.