Thanks cavedweller, got the gas grenade of thingiverse (credit to ghostbear for the model)
And a really excellent friend is modelling a lawgiver for me at the moment
Got the lower receiver done last night, and did a test fit and a little light sanding to get parts in place tonight.
I don't think he will be uploading the files any where, he did these as a favour so I don't have the right to say yay or nay sorry. I am working on my own version of the flash bang (my first 3D model) once I've got looking ok I'll post it on thingiverse to give a little back but as I'm only just starting with 123d its gonna take time.
As you can see it needs work, for some reason I printed the top out of scale. The arm button is way to deep and there are other things that are pushing me toward a total rework, might go two piece as all I did with this one was take inspiration from the IDM version