The MechTech Convert-to-Carbine Upper (CCU) for your Glock, 1911, Or XD pistol. Quick and easy installation allows you to convert your pistol into a sweet shooting carbine perfect for tactical, sport, hunting and defense. Simply field-strip your pistol to pair our CCU Upper with your Lower; no modifications! Many awesome accessories available along with many popular handgun calibers. Check us out today at mechtechsys.com