that's what you get for trusting certain online retailers who, when you specifically ask, tell you they are WE compatible and that turns out to be balls. And also when you trust certain airsoft 'Instagrammers' who also work for a certain airsoft magazine...
WE mags are meant to fit but, even according to the admission from the retailer, only fit when you remove the base plate..and the WE 50 round mag doesn't fit at all for some reason. Taking that into account I would say probably not. Plus it will probably cause the pistol to disintegrate quite quickly as they are utter arse.