CMMG 55A1A0B-AB: Take one trip to the range and youll swear this is everything the AR was meant to be. Chambered in 5.56mm with a 16.1 barrel, this Dissent rifle is one of the smoothest shooters out there.The rear of the Dissent rifle features the Dissent side folding stock with adjustable length of pull and adjustable cheek riser. A forward non-reciprocating charging handle allows for quick and easy manipulation without coming off target and the M-LOK handguard with top picatinny rail provides ample mounting space for whatever accessories you please. Adjustable Gas Block If youre looking to shoot suppressed or just fine tune your Dissent to your preferred ammo, the adjustable gas block gives you the freedom to dial in the gas system exactly to your liking. Never too much and never too little.