I'm not being extra careful with my AR180B-2, if the lower breaks at least now we have options. I'd probably buy a complete WK180-c as long as the lower is compatible with my Armalite upper and then re-barrel the 180-c upper to 300 Blackout or 6.5G. If not compatible then I guess it's a NoDak lower even though the price is stupid. It should at least come complete for that price. It's a rip-off but they've got us over the barrel if you want one. I definitely wouldn't drop $500 on one unless my 180B lower was broken though, I don't understand why guys have been buying them to replace their polymer lower that is not broken. Other than the peace of mind there is no advantage to the aluminum lower. Pretty sure it adds weight to the rifle as well which is negative in my mind.