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Matrix / AIM Lipoly Ready 8mm Complete Gearbox for M4 / M16 series Airsoft AEG ( M130 / Back Wiring)
[GB-Monster-130B]
$110.00 $95.00
by Heidi A. Date Added: Monday 24 June, 2013
Well, I'm not usually one to write reviews, but I was so impressed by this gearbox I couldn't help it. I chose this gearbox because I had previously bought the AIM torque up motor and was very impressed with it, so I decided this gearbox would be a great match for it. I'll stop boring you with why I got this and get right into the breakdown.

The shell is a real nice heat treated matte finished shell that looks great and fells really sturdy. The gears are also very good quality, but are fairly loud even when shimmed properly. This is probably just because they're new and will probably quiet up later. The 8mm bearing are just your standard bearings, and look like they have nice build quality. The trigger is a standard M4 style trigger, and makes for great contact with the wiring for pretty decent trigger response, even though the wiring does not even contain a fuse. For reasons I can't explain, however, when shooting in semi mine always stopped about one quarter rotation further than it should, even with corrected AoE (get a sorbopad with this, you'll need it). This really isn't that big of a deal, but it does put more strain on the gearbox when not in use, but it cycles cleanly, so I can forgive this. The spring guide was a little lose when I opened it, but it was fine after I tightened it. The spring is heat treated, and pretty good quality. The piston had some raised marks from manufacturing, which can be cut off with an exacto knife. If you want to but a new piston head on though, your out of luck. I tried my hardest to loosen it but that damn thing wouldn't even budge! At least the quality is decent and the O ring has perfect seal. The cylinder is a type O (non ported) aluminum cylinder and is very good quality. The cylinder head is a one piece steel head that is very sturdy. The air nozzle is fantastic, perfect air seal and has the plus looking thing (no idea what the proper term for it is) at the end which is great. Unfortunately I couldn't use it with my SCAR because the air nozzle is too short, but I wish I could. Tappet and selector plates are just standard, nothing fancy or special there.

Overall, this gearbox exceeds expectations, but just barely falls short of a tenouttaten because of the noisy gears, lack of fuse, slightly off semi cycling, and sub par manufacturing on the piston. I'm using this gearbox with a 363mm 6.01 tightbore, and .28g G&G BBs and I'm hitting 375 fps and getting a 4 inch cluster at 25 yds. Very impressed, you will be too.

Rating: 4 of 5 Stars! [4 of 5 Stars!]
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