Have you thought about going with a rifle buffer system? If weight is a concern (outside of the rifle buffer weight itself) there's the ARFX skeleton stock (a1 10" length I believe before adding butt pads) and the Magpul rifle stocks (a2 length or a bit longer if memory serves) that aren't very heavy at all.
Also, for a muzzle brake that won't break the bank, look into the Manticore Arms AR15 Nightbrake. Ploufdaddy (sorry if that's misspelled) has a video out on them and recommends them as best bang for the buck offering extremely similar performance to the BattleComp (and therefore I would assume Dynacomp as well) for half the price ($57).

