Hey, I was tightening up the pistol grip on my M4, and I happened to notice this little spring laying there. I had taken off the base plate for the grip, but the motor hadn't come out yet. I had unhooked the wires.
It's a torsion spring, probably about 3/4 of an inch long, with two turns in the middle section. Each end of the little spring bars are angled 90 degrees in opposite directions.
Any thoughts, or did it just happen to be laying there.