The Mechtech CCU for Glock in .40 S&W converts Glock 22/23-compatible frames into a 16.25-inch barrel carbine. Same concept as the .45 ACP version — the Glock frame and lower remain in use, only the upper assembly is swapped. Blowback operation, 16.25-inch barrel, integral Picatinny rail. Type: Rifle Action: Semi-Automatic Caliber: 40 S&W Capacity: 15 Year introduced: 2002, USA Weight: 40 oz Overall length: 26" Status: Active Intended use: Home Defense, Range, Conversion