Timney/POF drop-in AR15 trigger group
Patriot Ordnance Factory (POF-USA) worked with famous trigger maker Timney Mfg. to develop the Timney Mfg. Part #661 drop-in AR15 trigger group. This is a self-contained unit, along the lines of the McCormick Super-Match AR15 trigger (which they don’t seem to be making any longer). Instead of supplying you with separate components (new hammer, disconnect, trigger etc) which you install and adjust yourself, the #661′s individual components are assembled in a gold-anodized aluminum housing which is then installed in the lower receiver, in place of the stock trigger components. No adjustment is needed or possible by the end user.
The single-stage trigger pull is set at 3lbs. I don’t have a trigger pull gauge to verify that, but it’s lighter than the McCormick triggers I have. The trigger only moved .030″ to pull and reset. The trigger and disconnector are A2 tool steel and the hammer is S7 shock-resistant tool steel. The aluminum components are machined. The tool steel EDM’d, then heat treated and hardened to 58-62 HRC. The hammer spring is stainless, and the disconnect and trigger springs chrome silicon.