Timney 75th Anniversary AR-15 TriggerCommemorative Model 667S Competition AR-15 Trigger Upgrade- Timney Triggers for AR-15 and are also called the Fire Control Group. This unit replaces creepy two-stage triggers with a single stage that is smooth and crisp. These Limited Edition triggers are available pre-set for 3 lbs. Installation Instructions are easy to follow as this is a true 100% drop-in trigger with no adjustments required. The installation uses your original hammer/trigger pins and the system eliminates pin rotation and walkout. They fit AR-15s with "small Pin" (.152-.157) Hammer/Trigger mechanisms.- Limited Anniversary Edition - First Come First Served. Order Yours Today.