-I was given a Stingray II last year, in order to see if I could make a Freak back to fit (but haven't checked it yet.) If the Tigershark uses a screw-in barrel, I don't see why one of these wouldn't work. Got one to loan out? 
-An Illustrator should be able to take a conventional back- not necessarily needing these "retained" backs- but I think the "knuckle" where the back and tip screw together, would interfere with the foregrip.
Doc.

So... What about F2 Illustrators with the thumbscrew barrel, while also retaining the foregrip?
Doc.
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