I've got an dpms lr260 24" ss bull barrel cmc 3.5 pound trigger vortex viper 6.5-20x50 the gun shoots pretty damn good I've shot several groups under 3/4" and two very good groups measuring about .29ctc. I have recently Been thinking about getting the barrel threaded for a muzzle brake I'm just not sure its worth the money or if it will be beniftial to my rifle. Any input would be greatly appreciated.