Polenar Tactical explains why the Helikon SBR Gun Bag is his favourite in this video... "The SBR rifle bag is an amazing carrying solution for AR rifles. It will fit 10.5 inch rifles with no problem and 12.5 is the max you can put inside. Also fits 16.5 inch rifles if you separate the upper and lower receiver. You can fit two AR rifles inside of it, they are separated by a soft foam wall that can be removed. Rifles are secured with included velcro straps which prevent them from moving around and scratching. There are also elastic loops for magazine storage and two additional pockets on the outside for your range equipment. Can be carried around as an fairly unsuspicious backpack or you can tuck in the straps and carry it as a normal bag."