Mustacheod_Matador

It was extremely hard to keep it compressed when I put the gearbox back together, so the spring was definitely compressed. This makes me feel a bit better since I am not super eager about taking it apart again lol Okay I’ll give this a shot! I’ve noticed it’s a bit finicky to put the upper back on the lower because of the battery wire (front wired). I finally got it to fit right without the wire being compressed too much. After replacing the bucking, I’m having a slightly better result, but still inconsistency with fire rate and inevitable jamming. I think my next step may be bringing it into a shop and having an actual professional work it

Disassembled and reassembled the way you described. I was able to position the wire much better, but still had the same issue. I then took out the new bucking that I installed and put in my stock bucking. It actually fires now, but inconsistently. I’m going to charge all of my batteries and see if that is a potential new issue. At this point, I’m wondering if I installed the new spring backwards. I was so eager to get that gearbox back together after 2 hours of finagling that it’s possible I put it in wrong 😑

I’ll check that! Yeah, when I clear it, I have to wiggle the gun to get it to eject the BB from the mag slot. I can usually see the BB sitting there when I eject the mag and look inside. How would I fix that? I appreciate that! I wasn’t sure what 1.3j even meant lol I played with the hop up and it sounds better, but still jamming. It was working fine before messing with the spring. I ejected the mag and could see the nozzle moving forward just fine. Perhaps the new bucking is the culprit here? May have caused an issue when I reassembled it the attached video is the sound it makes with the magazine in. Nothing is coming out of the barrel, and bbs pour out when I eject. I’m using biodegradable bbs, but I’ve also used these before modifications without issue. FullSizeRender.MOV

Apologies! Didn’t understand the implication of the original question. I am in the US. This form seems the most active, which is why I ended up here. Reddit didn’t provide any answers. To answer your other questions, I’ve tried it with multiple mags from different manufacturers and it comes out the same. It will not put any bbs through the barrel. It’ll just jam the first one. Is it my motor that needs to be replaced to keep up with the M120? If the gearbox wasn’t such a booger to reassemble, I’d just pop the old spring back in at this point. Really appreciate the responses!

I don’t play on public fields. Just private with my family. The gun was so underpowered with stock parts. I use a standard 9.6V battery that I originally bought with it.

I have a front-wired G&G M4 Carbine Combat Machine that I bought new. Recently, I added a prometheus 6.03 inner barrel (380mm) and it ran just fine afterwards (I also put in the prometheus 50 degree/purple bucking). However, after adding an M120 spring, it will not fire with a mag inserted. Without a mag, it dry fires just fine. When the mag is inserted, it sounds like the battery is dying and immediately jams before getting anything down range. Any ideas on what it could be?