This is the M4 TCC 0512 Gen3 from SRC

This is the SR4 TTC Zombie Hunter LIMITED EDITION AEG pro airsoft gun. It has a pre-installed, super-unique metal rail adapter system [RAS], so upgrades and add-ons are installed with ease. A tactical forward grip is also INCLUDED in the package, and is typically installed onto the bottom rail panel. The RAS allows this rifle to be infinitely more customizable, as flashlights, lasers, optics, and other tactical accessories literally mount in seconds.

• Electric automatic; safe mode/semi-auto mode/full auto mode
• Rate of Fire: 800-900 rounds per minute
• Muzzle Velocity: 355-385 FPS with 0.20g seamless BBs
• Hop-up: Adjustable/integrated
• Gearbox: Full metal
• Receiver/body: Full metal, laser engraved & serialized
• Internals: High strength steel bushings w/ aluminum cylinder
• Internals: Steel high-speed performance gear-set
• Barrel: Metallic composite inner; Aluminum one-piece outer
• Motor: SRC ULTRA High-Torque
• Battery compatibility: 8.4v nunchuck
• Type battery (NOT INCLUDED)
• Weight: 8 pounds (extremely realistic)

This gun is great quality and it has some very nice features, such as both front and rear pop up sights. It also has great markings and a high quality hop up to enhance long-range shooting.

Ammo type: Seamless 0.20g or heavier (0.23g, 0.25g, 0.26g, 0.28g, etc) BBs. For maximum performance and accuracy, JBBG recommends BULLDOG ammo.

Note: Battery and charger are NOT included, as is the case with most SRC-manufactured AEGs.