Slot-in/slide-in universal Nerf Magazine holder

This remix is a bit looser and allows both newer and older magazines to slide in. Version B of the model may need be a little tight and I may have to redo that, otherwise, just print without supports and slide in! The rail section is slightly looser, as is the actual magazine part from the original model

The Retaliator pump grip is found on here, I remixed it though and will upload that as well. In addition i also added a stock extender from Thingiverse.