Unlimited Airsoft talks about the G&G ARP9 AEG if it is one of the best airsoft guns in the market.  This is the first Airsoft replica that mimics the design and function of an AR-9, a real firearm that fires 9mm pistol rounds from an AR15 rifle platform. AR-9 pistols and carbines are very popular in the US because they offer a lot of flexibility, familiarity, and portability.