Hi Gary and welcome. It is removable from the 1/2 x 28 tpi threaded barrel. Cheers, stay safe and enjoy!

it is threaded and removable see *****This legendary action is a tried and true Ruger design that ensures consistent, reliable performance.
Detachable 10-round rotary magazine features a unique rotor to separate cartridges and provide reliable feeding.
Easy-to-use, prominent magazine release provides smooth, no-fuss removal of flush-mounted magazine.
Cold hammer-forged barrel is locked into the receiver by a unique, two-screw, V-block system.
Positive, push-button, cross-bolt manual safety.
Combination scope base adapter for both Weaver-style and .22 tip-off scope mounts included.
Heat-stabilized, glass-filled, polymer trigger housing assembly is precision made of high-tech material for improved manufacturing tolerances, impact and abrasion-resistance and an unmatched ability to withstand the elements.
The receiver and stock combine to create classic lines for attractive styling.
Compatible with the Silent-SR® sound suppressor - Learn More
******Threaded barrel with 1/2"-28 thread pattern capped with Ruger® flash suppressor.