BudsGunShop.com - Mark IV Double

The pistol is "Single Action". This is a Buds description error. Rugers Info here: https://ruger.com/products/markIV2245Lite/specSheets/43909.html

Ruger calls it the Ruger 43906 MK IV 22/45 lite

Double Caliber :22 Long Rifle - Double Caliber :22 Long Rifle (LR) Barrel Length :4.4" Capacity :10+1 Safety :Ambidextrous Grips :Black Polymer Sight Configuration :Fixed Front, Adjustable Rear Weight :25 oz Frame Finish :Black Hard Coat Anodized Frame Material :Polymer Barrel Type :Threaded Slide Description :Black Case Type : Sight Style :Contrast Barrel Length Range :4.00" to 4.99" Weight Range :16.00 oz to 31.99 oz

answer continued I ran out of characters it is not a double action it is a single action they are great guns and the MK4 having the easy takedown makes it even better

The double is not in Rugers description (typo ?) Model Number: 43906|
Caliber: 22 LR
Capacity10
Receiver MaterialAluminum
Front SightFixed
Barrel Length4.40"
Grip FramePolymer
GripsCheckered 1911-Style
FinishBlack Anodized
Width1.22"
Rear SightAdjustable
Barrel StyleThreaded
Thread Pattern1/2"-28
Weight25 oz.
Overall Length8.40"
Height5.50"
Grooves6
Twist1:16" RH
CA ApprovedNo
MA Approved & CertifiedNo
Suggested Retail$559.00
• Simple, one-button takedown for quick and easy field-stripping and proper chamber to muzzle cleaning.

• A recessed button in the back of the frame allows the upper receiver to tilt up and off of the grip frame without the use of tools.

• Receiver is made of aerospace-grade aluminum and is ventilated, making the pistol extremely light.

• Comfortable, precision-molded polymer grip frame with a serrated frontstrap and checkered backstrap.

• Ergonomic bolt stop.

• Checkered, 1911-style grip panels for a great appearance and comfortable, non-slip hold.

• Internal cylindrical bolt construction ensures permanent sight to barrel alignment and higher accuracy potential than conventional moving slide designs.

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• Accurate sighting system features an adjustable rear sight and a factory-installed Picatinny rail for easy mounting of optics. https://ruger.com/products/markIV2245Lite/specSheets/43906.html