This laser is compatible with all three Ruger LCR calibers (.22, .380 and .357) and adds to the already available Ruger pistol offering which includes the Ruger LCP and LC9. The CenterFire laser for the Ruger LCR revolver offers seamless integration with the firearm to allow owners the benefits and confidence a laser provides without added bulk or sacrificed concealability. Controlled Activation gives users the confidence to control their situation - letting them choose when the laser turns on and won t reveal their position while un-holstering, reloading or on the move. The laser mounts directly to the frame without changing out parts - user installed in minutes. The constant red laser beam sits just under the bore for the highest accuracy and prevents the user's finger from blocking the beam.