Shape of grip area and the scalloping of frame.
The Fortis resurrection of the Bren Ten looks great. I wanted one myself but I think it may be too late for obvious reasons unfortunately. And a couple of design decisions made by Vltor are mistakes in my opinion.
I have two observations on the design. The first being the scalloping at the front of the frame probably to lighten it. The back of the frame seems thick enough for the slide stop area. It detracts from the way that particular designs looks originally (CZ 75 clone). I would also think the weight up front is needed for the 10mm!
Another area is the lack of a "beavertail" rear back strap. It is just a stub like someone decided to chop it off without thinkiing of the possibility of the web of the firer's hand being bitten - hammer bite.
All the folks at Vltor needed to do was to look at the EAA clones like the Elite Match which has a substantial frame and a very nice "bervertail" on it. Even the CZ 75B SA and SP-01s now have this design on their cast steel frames. This to me is a step backwards for the Fortis design.
Just my observations and opinions. My intent is not to start an argument.