This is a variation of the M1 Garland housed in a museum in Cody, Wyoming. This rifle was modified and prototyped by Winchester during World War II from the M1 Garland, and had a freestanding pistol grip, box magazine, bipod, flash hider, and the ability to switch between semi- and full-capability. It looks a little like the T20E1, but the distinctive feature is the freestanding pistol grip.
I would like to see this weapon added to the US BRV tree or as a Gold Order.
This is a seriously cool assault rifle.
Or distort space-time and bring the M14E2 from the future.