This design came from a specific request to hybridize our popular 1911 compensator with the 22/45 platform to create an easy to clean, yet effective comp for the 22/45. This model is 1.25″ OAL and 1″ in diameter. total weight is just over 1oz. The ports are indexed with a set screw on the bottom of the unit. The compensators are threaded 1/2-28″.