The .22LR threaded barrel for the LifeCard. Easily swap between standard barrels and .22LR Threaded Barrel. Storage tin and hex key included. – Back by popular demand LifeCard .22LR Threaded Barrel. With 1/2 x 28 standard .22LR muzzle threads this threaded barrel version makes your LifeCard one of the most discreet suppressor hosts currently available. The all-new monolithic threaded barrel includes increased rifling length for added bullet stability clearance for loading the tilt-barrel with or without a suppressor attached and a custom Trailblazer Firearms 1/2 x 28 thread protector.