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For: Ergo Medium Rail for MOE HandguardProduct Information:
I've got two of these things on my King Arms Colt M4 MOE Carbine and they are great. They screw right into the slots on the MOE handguard. Once they are in place they do not move. Be advised though, not everything can be mounted on these. So far every laser, grip, and flashlight has fit just fine but I had an issue mounting an M203 on it. The 203 in particular was a seven year old Echo 1 M203 so I don't know if it was just that launcher or not. It would sit on the rail but slid off sideways if you shook it a little. Other than that, these are perfect, and cheap, add ons.
Easy to install
Might have difficulty mounting M203s.
The Long Rail might have better luck doing that.