Looks like the (optional?) modular rail handguard has been tweaked some more, bayonet lug has been added to the bottom of the gas block, and the 10.5" barrel uses a different gas system (gas block relocated rearward) than the longer barrels.
pretty slick but I just can't decide which stock I like better. I think I like the top one better. The handguard looks the same to me but without the rails installed.
It looks as though they are trying to give more potential rail space. Or they wanted to make it look more futuristic, in which case, I would argue looks like crap.
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