Diving In

Setting up the trigger was the most time-consuming aspect of this build. The first step is to check trigger clearance in the frame and around the safety. The Retro lower had no issues with the trigger hole, inletting or safety. The next step is to install the trigger and spring without the hammer and adjust your first stage pull weight. It requires a trigger pull gauge. I use a Timney that I got from Brownells for $32 but any that measures down to half a pound will do the job. The trigger spring is adjusted by gently bending it with pliers just before the coil — toward the coil to increase and away to reduce first stage pull. It’s a matter of experimenting and unless you like the initial pull weight when your first install it, you are going to have to take it out and tinker with the spring at least once. I used the mil-spec pins from my lower parts kit and saved the nice tight Geiselle ones until I had that first stage adjusted.

Once you have the first stage pull weight set, the rest is painless. The hammer is installed and the three socket head screws in the trigger itself are adjusted with the Allen keys provided for proper sear engagement, final trigger pull and overtravel. If you are patient and follow the instructions in the illustrated manual, you’ll have a fine trigger as well as a better understanding of its function. By the way, these triggers have a lifetime transferrable warranty on them.