There is no doubt that the AR-15 and its almost limitless level of variants and manufacturers is simply the number one rifle of choice for civilians and law enforcement personnel. One of the many reasons the AR-15 is so popular is its “modular capability”—the ability to adapt to a wide variety of situations and missions—often by simply changing the upper. This capability has been explored more and more since the AR-15 popularity boom, but the majority of owners, particularly law enforcement users, may not have used this capability to full advantage.
Due to manpower or budget constraints, snipers may not always be able to deploy as snipers if the team comes up short on entry personnel. These SWAT snipers end up having to haul around two separate rifle cases to every callout, not knowing which weapon they will end up fielding—their M4 Carbine or their scoped .308 bolt gun.
If this sniper could have an entry and sniper gun with the exact same operating system, and the exact same controls in the exact same position, the potential for operational errors could be reduced. Further, if done right, a setup like this would mean only one carrying case for what are essentially two guns. This can only be accomplished by using an AR-15 weapon system with one lower to be used for both an entry and sniper gun.