If you are looking to use any bipod other than the Swiss Arms (which you wouldn’t with carbine handguards), your best bet would be the B&T front handguard/ quad picitinny rail. Couple that with the original butt stock and a cheek riser for the scope.
The quad rail adds weight and doesn’t float the barrel and gas system, but it looks like the way it is set up, it isn’t light anyhow.
Or, (and Imho the best setup and use), you should strip it down and run an RMR or Aimpoint max. or right down to the bare bones and use it as intended - offhand and positional shooting with irons.