I don't think anyone ever made those to the best of my knowledge but maybe @Lucky13 will know.

 

No one I am aware of. It would have to be a custom made job. The top of that back plate doesn't have much flat space left to weld brackets to, and the bottom has a taper to it which complicates things. One would have to use four separate pieces for the brackets, given the latch is top center and the safety bottom center. It's not impossible, but definitely challenging. A good machinist and welder could do it, but I have no recommendations.

 

Seems like the charging handle would need to be modified to reach around the grips.

I have never seen this done but its a maybe.

 

Thanks guys. I have a client who seems to want these. Anyone looking to take on the job, he has more money than sense so... it could happen.