I am struggling to find the .625 low profile gas block, gas tube, barrel nut and Delta Ring in one spot.
Also, since i have to pin the flash hider, I am sort of liking this gas block,, two piece split design, and I can still pin it myself.
Yankee Hill Machine Specter Gas Block .625 YHM-9377A - Black Rifle Works
What about Spike's? Looks like they have all that.
Spike's Tactical Micro gas block (.625) [SUGB110] - $29.95 : Spikes Tactical
Mil-Spec 303 Stainless Steel Gas Tube [SUGT00x] - $12.95 : Spikes Tactical
Mil-Spec Delta ring assembly w/Mil-Spec Barrel Nut [SDR100A] - $18.95 : Spikes Tactical
Aren't you putting on your own rail system (Troy/VTAC)? You won't need a delta ring, and it probably uses its own barrel nut.
ETA: Yep, it does come with its own barrel nut.
Troy Industries 11.0 TRX Extreme Battle Rail Installation & Mini Review Video | AIM
With an aftermarket rail system and low-pro gas block it shouldn't matter. You'll just simply slip the rail right over your flash hider and barrel. Unless you're thinking you may change out your gas block later.
I am struggling to find the .625 low profile gas block, gas tube, barrel nut and Delta Ring in one spot