This is one the first AR pistols to be chambered in 9mm to hit the airsoft market that doesn't require an adapter. Primarily the reason the AR 9mm receiver was developed was due to the increasing cost of normal AR calibre ammunition. This airsoft weapon has a 300 round high cap magazine in the style of an extended G-series magazine. The G&G ARP9 has been fitted with G&Gs new ETU and mosfet, meaning your electronics are protected. You can also change the full auto setting to 3 round burst by hold the trigger down on semi-auto for around 10 seconds. The light weight build of the ARP-9 along with the fitted furniture gives it very modern look. Featuring a 5 inch MLOK rail and 2 position collapsing stock this airsoft gun is ready for any tactical situation. When you get the G&G ARP 9 loaded up with BBs and a battery it has an epic bark, giving the G&G Firehawk some serious competition. The ARP-9 is the perfect little airsoft SMG if you are looking for something different without having to compromise on features.