Classic Army M15 series

The Classic Army M15 series rifles are full-scale AEG replicas of the various M16-type and M4-type assault rifles currently in use by the United States armed forces. They are made by Classic Army.

All replicas feature metal receivers, strengthened gearsets and stiffer springs than AEG's from manufacturers such as Tokyo Marui, and also feature laser engraved "ArmaLite" trademarks, just like those found on the actual M15 series weapons produced by ArmaLite.

Complete replica of the venerable ArmaLite M16A2 rifle. The only real difference in this airsoft weapon is this rifle features fully automatic fire. Since the real ArmaLite M16A2 is made for civilians, it only shoots semi. Accepts large batteries.

Carbine version of the above rifle, featuring cut-down 14-inch (360 mm) barrel and collapsible stock, much like the M4A1. Accepts small batteries.

As the standard carbine, but with the rifle's large stock in order to accommodate large batteries.

Full-size replica of the current-issue M16A4 assault rifle. Features removable rearsight assembly, revealing a 20mm rail for mounting optics. As with the A2 version, this rifle accepts large batteries. It shoots at a velocity of 280 to 320 ft/s (98 m/s).

Full-size replica of the M4A1 assault rifle. Accepts small batteries.

Same as M15A4 Rifle, but with Carbine barrel and hand guard assembly

As standard Carbine, but equipped with a replica Rail Integration System for mounting extra accessories, such as flashlights, grenade launchers, etc. Comes with an external battery box which accepts larger batteries than usual.

Special Purpose Carbine; this rifle is essentially the RIS model with a full stock for accepting large batteries.

Special Purpose Rifle; this rifle is essentially an M15A4 rifle with a full-length RIS, forward pistol grip and Lewis Machine & Tool rearsight. Accepts large batteries.

This model also features a 7 mm gearbox, giving higher out-the-box performance in terms of muzzle velocity and rate of fire.

...
Wikipedia