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AP Custom uses a standard barrel nut, so just add the 1.4oz to the finished weight. But again though you'll want to ask for rail mount vent slots all along 3,6,9,12 o clock, since I believe it's missing the bottom slots I think. That'll reduce the weight just a bit further too. And I believe...

Yep, the Heavy Duty is a specific model. http://megaarms.com/ar-15/upper-receivers/billet-uppers/sbu-billet-upper-wo-ch-slot/ As you can see, it weighs 13.4oz, vs Mega's standard billet upper which weighs only 9.4oz...

Jp Low mass is going to be inappropriate with the switch block I think. I'm fairly sure though not 100% that it only has normal gas and suppressed, which means it'll either be over gassed or under gassed. I see you choose the JP silent capture as well. I'd have to recheck on that but I wanna...

Upper: You want something super stiff. I'd recommend against the Legion upper and instead suggest something where they deliberately went for a thick, stiff receiver with no regard to weight. Options are: Mega Heavy Duty Billet Upper (The octagonal shaped one) SunDevil Billet Upper Rainier...

Hey guys, I'm trying to build a general purpose DPMS AR10, and in order to keep the weight down I'm really considering a Proof Research bbl. What I'm dreaming of is a lightweight barrel that's accurate for long range shooting, but could also tolerate the kind of punishing firing schedule...

I'm ordering an AR10 barrel, the blank which I'd like to get from Bartlein. It'll be a 16.5" .308 Winchester bbl. I'd read that the top competition shooters are starting to use gain twist, and I'd like to look into it if I can get more info. I'd like to go all the way up to using 208 gr...