1stTimeBldr Posted December 19, 2020 Report Share Posted December 19, 2020 I am in the final stages of building a JMT 80% AR-10 polymer lower. Milling went ok, and basic parts installation (pivot pin, mag release, bolt stop, trigger) all went ok. When I install the safety selector by itself, everything works normally - drop-in trigger releases on Fire, does not release on Safe. When I install the detents / springs and pistol grip, the trigger no longer releases on Fire. With the grip installed, I can move the safety selector between Safe and Fire easily and I feel the detent engage in both positions. I have tried the following troubleshooting steps: Install safety selector only: Trigger functions normally Install safety selector, and grip screw only (no grip or detents ): Trigger functions normally. Install safety selector, grip, and screw – with the screw backed out several turns (there is about a millimeter of space between the grip edge and the border of the grip mount on the lower. I did this because several posts mentioned that the screw might be overly tight.): Trigger does not function Install safety selector, grip, and screw fully tightened: Trigger does not function Take it all apart – Trigger functions normally I am at a loss – I do not know how the grip could be affecting the trigger. Any ideas? Quote Link to comment Share on other sites More sharing options...
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