The M4 CQB RIS AEG by A&K is a high quality airsoft gun with great value. This gun is loaded with full metal parts, including the outer barrel, the RIS quad rail, and the buffer tube. It also has a high quality full metal gearbox with metal gears. It chronos right around 330 to 350 FPS with 0.20g BBs, which is ideal for CQB play but will also work for field skirmishes. The hop up is adjustable for increased accuracy. The included high capacity magazine is also made of metal and holds up to 300 rounds. The iron sights are also made of metal and the rear sight is adjustable for windage and elevation. The rear sight can be removed to reveal a full length picatinny rail which makes it easy to mount an optic such as a red dot sight. The gun also has a quad rail which runs down the outer barrel. This rail system enables the user to attach accessories such as lasers, flashlights, and foregrips if so desired. Two rail covers are included as is a tactical foregrip.