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Left: Crescent A-N Pliers (plastic jaws for the hand guard nut and and also the barrel nut).
Center: Wheeler screwdriver set. Well that's useful for a lot of stuff, I guess. Particularly mounts and optics etc
Right: Long T-handle with 6mm hex for getting the butt stock free of the receiver. I got that from Shooting Shed (thanks Dave) and can vouch that it is a quality tool.

Other basic tools you can add are a bench block which in its simplest form is a block of wood with some 6mm holes drilled in it and a slot cut down one side. I also use brass push out/alignment pins for the trigger which I make myself (Beware, pins on BR99's push out right to left)