Re: Manners prototype M1A stock
Who are you marketing this toward?
It looks like a great rig if you want something that is more akin to sitting at bench, riding in bags, or a rest.
I have MCM M3A. Things I don't like - weight number one. Cheek piece shoots loose constantly. Cost (including bedding). Width of front end is a little narrow. I don't want it as wide as an A5 but a hint wider wouldn't be bad.
I don't think the void is another, but differently shaped accuracy producing, expensive stock - drop in or not. I think the real hole in the market is represented by those folks that would take a USGI fiberglass stock, add stiffeners, bed it and add a cheek piece from Karsten. Something as light, rigid, and accurate as possible. Drop in makes it accessible to all.
ETA:
If a manufacturer is going to go through the effort of adding a lot of structure, weight and hardware to a cheek piece for an M14(clone) the least they could do is provide an actual lockout since you won't be removing it for cleaning.
Overall it makes more sense to create a simple lightweight cheek piece like Karsten's.
In general - I'm thinking accurate walking gun able to handle optics as opposed to heavy weight range toy.
Just me.
Good luck