Retro Arms CNC Machined Aluminum Fire Selector Cover / Plug for M4 / M16 Series AEGs (Color: Blue)

"Good fit into most AEGs, but not ICS

"Got one of these for my buddy's M4 and it fit perfect. I super glued it just in case and it still managed to pop out. I'm not sure how as it seemed to fit really nice and tight and even popped into place with an audible click. I guess it's still a 5 star since I don't think it could have been a better fit.

"Perfectly fits into Krytac shell, well made 10/10.

"I'll definitely say, this is a good product for when suddenly your cover goes MIA. Sadly, it's definitely not comfortably fitting my EMG lower, but I won't make the product look bad for that.