UMP adapter to M4 mag

Hi, thanks to this adapter you can mount : M4  1200RD ELECTRIC DRUM MAGAZINE or any other M4 mag !!! :) 

To secure the upper part I used a spring from a lighter.

Flat printing recommended!

Infill 30%  or over.

I printed the main part flat with tree supports .

I am using the Ender 3 printer but it is not on the printer list of this website

Because I do not have  closed chamber I was printed all PLA

The obj. files are the same as stl.

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