There are many products like Weld-On which is made to glue ABS plastics but I've never personally used any on an airsoft gun. The problems with FAMAS' is that there are no spare parts like body kits made for them that I can find.
Unless someone offers a better solution go down to your local hardware store and ask for an ABS Glue. Sand the area of the crack to get rid of the finish over the crack, apply the glue and let dry the maximum amount of time it says for that glue. It won't look pretty and I'll probably get flamed for this but that is the only thing I can think of until someone posts a better way.
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