For me, I found that they easily get flipped up without me knowing it while the rifle is strapped to and rubbing against my pack walking through brush and whatever else. Then they break off at the hinge. A few times I suspect they got partially opened when bouncing around in a scabbard, then when I pulled the rifle out the partially open caps caught on the inside of the scabbard and broke off.
They’re a PIA to open with cold, numb fingers. The plastic also gets brittle in extreme cold and even when “working” fine in that cold any bumps side to side when the caps are flipped up easily breaks them off.
Maybe I am just rough on stuff. I dunno but I just don’t like them.
