APS Battle Type QD Folding Rear Sight for Airsoft AEG

"I bought this rear sight to go on my GR300 because the screws were stripped and it held poorly to the rails. My biggest concern was the materials and the height when flipped up. It lines up fairly well, although as far as I can tell, I can't find a vertical adjustment for it, but it may still exist.

Pros:
+Metal Construction
+Very little wiggle when mounted
+Super easy to attach and detach
+Horizontal adjustment is very easy
+Finish is actually okay and is even

Cons:
-No Vertical adjustment
-May not line up with lower set front sights
-CQ Peep is rather large and may be a bit inaccurate, may need to radius further from the eye
-Mine showed up really greasy. No idea what that was about
-Rather easy to flip down and may fall down unknowingly.