Back plate/retaining plate/hold down plate/mechbox backet for the Tokyo Marui P90.
NOT MY MODEL. All credit goes to the original creator LothanStar on thingiverse (Source).
NOT FOR SALE BY ME! Go to the original creator's thingiverse page to download and leave feedback there.
This listing will only be public so people can find the model in two different locations and thus be more accessible to find.