I like where you're going with these builds. You asked for some input, so here's my $0.02... On you're "tactical" build: 1. Check out brownells.com for stainless 16" Fulton Armory barrels. They make one with a rifle length gas port. 2. For the money you're spending on a JP handguard, I think there are better options for a tactical rifle. Of course there's the common DD or SWS rails, but if modular is your thing, then I say check out the Apex CNC Machine handguards. 3. Muzzle devices. I don't know why you need custom, unless you make these yourself? Check out Battlecomp's BABC, or PWS's fsc30. 4. No need for the JP adjustable gas block on a tactical build... See my reasoning below. (unless you have a silencer) As for your "med range" build: The Remington .260 in a 24" barrel is easily a 1,000 yard rifle. I don't know how far you regularly shoot, but that is way beyond my "medium range". My only suggestions are a fluted bull barrel with a Benny Cooley muzzle brake, and the longer (15") JP handguard. It'll give you more real-estate to rest your rifle on a bench, and you can mount a bipod that much further forward. It doesn't say it, but I assume you're putting an adjustable gas block on this upper too. My personal opinion about gas vs weight, is to gas a target rifle and weight a tactical rifle. I see weight as a heavy object moving inside my rifle, and that may cause complications at long range. Gas is tricky to the point that not enough gas means failure to cycle. Instead of a massive heavy buffer, I would look into something like the Enidine hydraulic buffer. Then install a carrier weight system on your tactical build. Your medium (long) range build can adjust the gas to reduce felt recoil.