Retaining the ergonomics of the Benelli forearm is a priority. The failings of the Surefire M80 rail was primarily due to the fact that the rail system placed any mounted items right where your hand is meant to sit. It also made the forearm too thick. It was like holding onto a pringles can with spikes.
A replacement forearm would be a valued item for US made parts compliance. Additional colors would be a plus. I'd opt to have mounting holes on the forearm that allowed the option of short picatinny rails to be placed where needed. Preferably around the 10:30 and 1:30 positions, parallel with the barrel. This would keep the handguard area clear for your hands.
The key would be to minimize weight on an already heavy system. Adding long top rails serves little real world value. The mounting points between the receiver mounting bracket and the barrel hanger bracket are strong enough that a top support rail isn't needed.
Some tape switch pocket ideals could be explored. Maybe a wire routing option to limit exposed wires.
I handled the prototype at the show on the M2. The LOP is excellent. I don't think the QD mount will hit my nose under recoil either.
One thing that I wasn't clear on was:
The rubber grip. Is it the Benelli Factory rubber overmold grip, or are you supplying an aftermarket one? The one on the prototype felt smaller than the factory pistol grip. If it is being replaced, why? It seems logical to use the slip on factory one.
Have you considered putting a storage compartment in the rear of the stock? I know in the factory stock, there is quite a bit of room in the tail section. Same story for the pistol grip itself. Since the rubber sleeve simply pulls off, there is a nice place for storage there. Be it spare parts, a small oil bottle, cleaning kit or batteries.
Also, do you have any plans to have them molded in any other color than black?
Any intention to offer a stock mounted shell carrier that is hard mounted rather than an elastic nylon type?