Magwell adapter requires AOW stamp?

[above_all]

The one in your link is the Micro Roni Gen 4. Mine is the the latest MCK version. Kind of makes your head spin. I don't know. Maybe the forward grip on the MCK being an integral part of the assembly makes a difference. Good questions though.

 

[above_all]

Looks like the MCK has it integrated in the design but the other is "add" on , wondering if that could make the difference ?
Sad , have to worry about a piece of plastic lol

Dang. Great minds think alike.