I have two 14.5" Sig 516 piston uppers, 2nd generation, one of which is pinned and welded with a Dead Air Keymo. They both have the Midwest Industries hand guards installed, which are lighter, lower-profile, and just way better the stock quad rails. The pinned and welded has between 300-500 rounds on it, the non-welded has about 150-200 rounds. I just never really got to shoot them.


 


They're awesome uppers and if you don't know the history you should look it up, but the nutshell is that some of the the HK416 designers got poached by Sig and made an updated 416. They left after that and did one for Caracal which is apparently even cooler but that's beyond the point. Looking for 800 each, both for 1500.