on a gun i think the pistol grip is the leader. same with a detachable mag. they were designed long time ago and still in use.
some old designs are better than new ones. most companies today want to cut costs resulting in a cheaper inferior product.
there could be a better design out there but for what i can think of pistol grip ar is a good one.
whats next a metroid gun?
i heard this new law mad all rail guns illegal too? wtf is that