Ruger 22/45 with 3" barrel will be used with a Griffin Armament Checkmate HD suppressor attached with a threaded barrel with Griffin Cam Lok. The Checkmate HD is 1 1/8 inch in diameter. The SIG 365 X has suppressor sights, a RDO, and a threaded barrel with a Griffin Cam Lok adapter. If you have any questions, please contact me at: 570-205-9281, Thank you. J. Frank Burke Captain, PA Dept. of Corrections, Retired