A&K M4 GR-300 Carbine Full Metal Airsoft AEG - Long

4.5 stars, based on 22 reviews

$235.00 $185.00

ID: 30324 (AEG-AK-G300-L)
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.

22 Customer Reviews

by Grant B. on 12/24/2015
"This Weapon is amazing! I Just received it yesterday and I was surprised to feel how heavy this gun was.I liked it. The battery fits perfectly in the chamber. It has a little rattle with the magazine, but that's all that's bad about this Weapon. It hurts when you get shot from close range, so you probably may want to get a pistol or lower FPS Weapon. In all this Gun is AMAZING! Great buy for 185.00. Recommended.
by Ernest M. on 09/29/2015
"Just got one of these last weekend and took it out shooting. The weight and balance of the gun are better than you'd expect. While the metal construction of the receivers, stock and barrel are solid stamped metal, they're still lightweight enough to feel comfortable carrying, but solid and well balanced enough to feel easy to handle.

The motor felt a bit sluggish, even with a good and freshly charged 9.6v, but that was remedied when I lubricated the gun, and it got it back to a very respectable rate of fire and reduced trigger lag by a noticeable amount.

The hand-guard is probably the only part of the gun that feels chincy, but that's just how it feels, after using it I realized the flexible polythene was there to make swapping out batteries less of a hassle.

The front sight came off easily when the bottom post is unscrewed, allowing me to put on an optic with great visibility. The only real problem is that some of my MetalTac Hi-Cap magazines weren't as solid in the receiver as they are on my old D-Boys and G&G M4s.

Easy to operate
Good design decisions in terms of usability and ergonomics
Solid performer
Great accuracy out of the box for an M4 variant

A lot of rattle to the build, requires a bit of know-how to remedy
hand guard feels flimsy
Magazines can rattle a little in the lower
by Aidan O. on 09/07/2015
"I've had this particular rifle for a few years now and it still works fine. The only real proplem I have had with it is that I can't find any rails that actually fit it.
A&K M4 GR-300 Carbine Full Metal Airsoft AEG - Long

A&K M4 GR-300 Carbine Full Metal Airsoft AEG - Long

A&K has long been a player in the Airsoft AEG market and now they are poised to tackle an even larger segment of the market with their new NS15 series of AEGS. A&Ks NS15 series of Airsoft AEGs takes their already popular line up and modifies them in the factory with some of the most popular upgrades around. Internally the A&K gearboxes now feature a quick change spring system, which allows the user to modify the FPS of the gun easily and without having to disassemble the entirety of the gearbox. A&K replaced the standard 6mm gearbox bearings used in their previous gearboxes with the larger, more durable and efficient 8mm bearings as well as reinforcing the gearbox shell itself. All of these upgrades, now made standard improve the durability and reliability of A&Ks NS15 system and allow for the use of LiPo batteries up to 11.1V.


  • Full Metal Receiver
  • Side folding stock
  • 20mm flat top rail receiver
  • Ventilated style gas tube
  • Adjustable front and rear sight
  • Removable rear sight
  • Front and rear QD sling points
Length: 800mm, Full length
Weight: 10 pounds
Inner Barrel: ~400mm
Magazine Capacity: 450rd Hi-Capacity. Works with Matrix, G&G, Tokyo Marui and other compatible M4 / M16 Series Airsoft AEG Magazines
Muzzle Velocity: 370~400 FPS (Measured with 0.20g BBs)
Thread Direction: 14mm Negative
Gearbox: Ver 2 Full Metal, Fully Upgradeable
Motor: Long Type
Fire Modes: Semi/Full-Auto, Safety
Battery: 9.6v Small Butterfly Type recommended (Battery not included. Wired to front with Tamiya connector)
Hopup: Yes, Adjustable
Package Includes: Gun, Magazine, Manual


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