DE Gas Shotgun M4 Mag Adapter Fitting?

[Airsoft_Mr B]

Hey all,

I remember reading a while ago this mag adapter is supposed to work with the Double Eagle M870s?
 

Wondered if anyone had got it to fit, I am afraid to try to force mine any more.

Thanks in advance!

J

View attachment 77171

 

[AK47frizzle]

Not done it before but I've heard that you need to remove the trap door first