"I replaced my existing gear box that has a m120 spring with this one and all was fine at first.
I don’t have a chrono but I can tell the BBs fly a lot faster.
The motor that came with M4 S-System was adequate(using 10.8 v batt) to work the new 160 spring.
But in less than 50 rounds the new gear box locked up... I was really bummed out.
What I found is that the piston head screw had come loose causing the spring bearings and baring alignment nut to get jammed up in the cylinder locking up everything.
So much for QA.
Anyway, I re-assembled the piston/bearing and used red lock tight on the screw to make sure this didn’t happen again.
Got the gear box back together and into my M4 and so far it’s been working fine.
Eventually I'll need a stronger motor as the rate of fire in auto is relatively slow.
As a result of the total jam up caused by a loose piston head screw, I can only give it 3 starts as it was a lot of work to fix it.
The gear box is really good, don’t get me wrong…, its feels solid and appears to have excellent parts, but a loose screw? "I just got this gearbox and it appears to be great. I had it checked out by a certified airsoft technician to ensure it was properly shimmed. To my surprise it was in perfect shimming condition so that was awesome. Unfortunately the piston broke as soon as we tested it. Upon further investigation the spur gear lost one or two teeth. Not sure why this happened even though I used the recommended Matrix Magnum motor with it. I am waiting on Evike to respond to exchange the unit or the broken parts. This appears to be a solid gearbox. Even though I had a misfortune of events, I believe this to be an awesome piece of gear. Not to mention that Evike stands behind all their products and have a great customer support base. The grease is very minimal so if you are opening this gearbox then you will need to add some grease. Please be advised that I was fortunate in getting a properly shimmed gearbox. You still need to have it checked prior to using as stated in the product description. I also highly recommend you use a certified airsoft technician to do this work unless you are very familiar with gearboxes. I hope this review helps out. Have fun! "i must say this is an awesome gear box for the money the best buy for someone that doesnt want to put in the time to build from scratch very strong and hard hitting nice rof shoots about 480-525 fps with 30g bbs im very happy with this buy was a drop in and play assembly i would recommend this to any advanced air soft player out there i have personally bought 2 of these gear boxes
Port City Air soft Team Read More Reviews Write a Review
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Matrix / AIM Lipoly Ready 8mm Complete Gearbox Set for M4 / M16 series Airsoft AEG (Monster Torque) - Wiring to the front / hand guard
*Motor Not Included / Sold Separately. Recommended Matrix Magnum Motor.
For Experienced players only. This complete gearbox set is essentially a pre-assembled complete reinforced / tune up kit for your M4 / M16 series AEG. Manufactured by Matrix Tactical Systems, one of the most established, reliable and well known Airsoft manufacture in the world. This gearbox is an affordable alternative over the Systema gearbox with 8mm bearing sets. The
Mecha box shell is modeled after Systema's new gearbox design with thickened shell. With the more stabilized 8mm bearing set, this gearbox is more attractive than ever!
Matrix Tactical Systems. OEM: AIM. Matrix is the exclusive US Distributor for AIM Products.
Tokyo Marui, Classic Army, Echo1, JG, G&G, G&P, Echo1, DBOY, SRC, A&K, KWA and compatible models. Modification might be required for certain brands.
Matrix Tactical Systems Gearbox Models :
Available in Monster Torque and Tornado High speed. Front wire and rear wire.
- Systema / G&P / Classic Army Type 8mm Enhanced "Thick Type" Mecha Box Shell.
- M160 Spring. Velocity out put for this gearbox is around 500~600 FPS.
- Low Resistance / High Capacity / High conductivity / Wire & switch assembly Set.
- High Grade 8mm Metal Bearing Set Installed. Providing enhanced stability over the 6mm and 7mm gearboxes
- Ball bearing CNC Stainless metal spring guide.
- Matrix Ultra High Performance High Speed Piston with Metal full teeth strip.
- CNC Stainless Steel Cylinder Head.
- Reinforced Silent Polycarbonate Piston Head.
- Steel Gear Set
- Reinforced Nylon Smooth Selector plate and tappet plate.
- Reinforced Ball Bearing Polycarbonate Piston Head.
- Reinforced Matrix Monster (Torque Up) Gear set Installed.
Complete Gearbox Disclaimer:
We have compiled a series of videos for AEG take down, assembly and gearbox for your reference. Recommended for experienced players only. A "gearbox" virtually never breaks, Evike.com offers spare parts for all components. All gearboxes are sold as complete set of parts and "AS IS". All the gearbox are directly from manufacture. Buyer responsible for fine tuning and proper installation. Evike.com is not responsible for shimming it perfectly or playing the game of airsoft for you.
For more information on complete gearboxes, please visit:
Complete AEG Gearbox Review:
A good gearbox on par with the KWA M4 gearbox. One advantage of this gearbox over the KWA is that all 6 bearings are standard size 8mm bearings you can buy. Making it much easier to work on. The monster gear set can power up to M170 spring combined with magnum motor. The inner wall of the gearbox is reinforced, just like the Systema new type
Mecha box shell, with all the inner walls thickened. Easy installation for most major brands of M4 / M16 series AEG. Great performance.
To install this gearbox on a MOD5 series, although it is a version 2, the nozzle, selector plate and trigger are not the same. Slight work and gearbox knowledge will be required.
This product was added to our catalog on Wednesday 02 September, 2009.