I'll edit this into my first post also.
I would like to see a complete modular system.
Also, both traditional and bullpup layouts, with many parts common to both layouts.
Something that can be swapped around and customized, and that has a lot of parts already made.
This obviously means using a lot of AR parts, but yet NOT an AR.
*AR-15 fire control group (FCG) parts (trigger, safety, etc). These parts are common, cheap, reliable, and approved as not FA.
*AR-15 barrel dimensions, but without barrel extension. Bolt head and barrel extension to have larger beefier lugs. Perhaps 3 lugs?
*Bolt head to have a larger diameter head to allow for larger dia cartridge heads to be chambered.
*Completely new bolt carrier, that cannot be deemed a "variant".
*AR-15 pistol grip.
*Short stroke gas system
*Adjustable gas system
*Recoil spring to telescope into rear of bolt carrier, to allow for a side folder or bullpup design
*"Classic" wood (like AK-47 or VZ52/57), or modern Aluminum and polymer. Ability to swap parts back and forth.
*Aluminum to have M-Lok mounts. Wood to be old-school.
*
Thoughts?