Why doesn't anyone offer an M1 carbine with a 14.5" barrel and per attach flash hider?

Why doesn't someone offer an ultra light fiberglass stock?

What about a comeback of the 5.7 Johnson? It should perform quite a bit better than a 5.7x28.

I sure wish the HEZI SM-1 bullpup conversion of the M1 carbine had taken off.

Just thinking out loud.