Quoted:
Looks like the Timney I just installed in one of my ARs, although the chassis is a different color than mine. Might be a trick of the lighting though. Clue is the two allen screws, one on either side of the trigger. There are two screws in each hole. After installing the trigger, the first screws are tightened down to put pressure on the floor of the FCG pocket creating tension to hold the pins in place. The two more Allen screws are tightened onto the first two to lock them in place. To my knowledge, they are the only company that does this. But I could be mistaken on that feature.