G&G's Top Tech line of airsoft guns bring a revolutionary new addition to the hobby: reliable blowback in an AEG. Previous attempts involved using springs to imitate real life bolt actions but they caused excessive wear and broke down regularly. Top Tech's new system system involves pneumatic blow back with a piston driven gas operated mechanism. Compressed air is moved into the bolt which creates the blow back and keeps the stress out of the gearbox.

Official Specs:
Material: AL6061/Aluminum Alloy/Nylon/Fiber/Steel/Zine/Plastic
Overall Length: 780mm
Weight: 2700g
Inner Barrel Length: 357mm
Muzzle velocity: 90-100m/sec with 0.2g BB
Motor: 25000 rpm Hi-torque
Spring Guide: Ball Bearing
Magazine: 450 Rounds

Ok, so I get the marketing hype, what does this mean in real life. Hands down, a much more authentic replication. This feature is a subtle change during an actual skirmish but it is just one piece of the pie that makes up the realistic military replicas that airsofters enjoy. It's actually shocking that other retailers haven't zeroed in on features like this.

If the blow back is pneumatic, does that mean I am going to loose FPS? Nope! You can lock the bolt back and prevent it from blowing back and the recorded FPS was only 2-3 fps less indicating no impact. We observed the following average FPS:

.20 BB: 342fps
.25 BB: 305fps

G&G has not only made a unique addition to AEGs they have done so at an affordable price. You should expect to find the Top Tech M4 Carbine in the $400 range when first launched.

So, they've changed AEG internals. How does this affect upgrades? AS-R didn't have a chance to upgrade the gun during our hands-on time but we did check in with G&G and get the scoop. They were quick to point out that traditional types of AEG upgrades such as bigger springs to increase FPS could be added with no problems since their blowback piston is external to the main functionality of the gearbox. Any upgrade that can be used on a standard G&G carbine can be used on the Top Tech.

So do I want this gun just because of the blow back? I'm glad you asked! While the pneumatic blow back system is an excellent upgrade on the gun, what good would it be if it wasn't supported by a solid and well built gun? The full metal body and excellent construction is very noticeable the first time you pick the gun up. It feels very hefty and also features licensed markings.

Another feature I haven't seen in other AEGs is the working safety indicator on the back of the safety lever. As you cycle through safe - semi - full you can observe what state you are in on the reverse side. Accurate! The gun also features a working forward assist that when pushed releases the tension on the spring for storage.

Overall, this Top Tech M4 Carbine is an excellent weapon that has proven reliable and a top performer in skirmishing. It's solid fell, strong construction and realistic performing parts escalate this above other AEGs on the market and make it worth a serious look.