Vtac 11.0 Extreme BattleRail w/ MagPul AFG
The one thing that Im not too crazy about with the Extreme BattleRail design is the barrel nut. At-least Troy now includes their proprietary barrel nut wrench with their BattleRails. I would NOT try to install the Troy barrel nut without the proprietary Troy wrench. The barrel nuts are pretty delicate, and the teeth on them are easily sheared-off if your wrench doesn't fit exactly right and you need to torque it over about 40ft/lbs or so to get proper gas tube alignment.
My advice on setting-up the AFG on the BattleRail is to line-up the rear edge of the AFG with the rear edge of the longer length rail. Otherwise there will be a visible gap between the AFG and the tube, which not only looks like shit, but can also be a snag hazard if you run a 2-point adjustable sling. Here's a pic for reference:
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