Classic Army G36 to M4 / M16 Magazine Adapter. 
Adapter can be used to replace the existing magwell on a G36 and then you can fit the M16 magazine to your G36.
Compatible to most common AEG M4 Mags. 
Material : Fiber Construction

Classic Army A279P G36 to M4 Magazine Adaptor

SKU: CA-G36-A279P