M4 won't shoot properly

Discussion in 'Gun Building, Modifications & Repairs' started by JR4800, Jul 25, 2016.

  1. JR4800

    JR4800 New Member

    So my M4 was shooting fine put it up for about a month took it back out (no the spring wasn't under tension and it wouldn't shoot. The motor worked fine so I took apart the whole gearbox and found no problems so I put the whole rifle back together. I ended up just having to loosen the screw below the motor to put less tension on it and then the bolt operated fine until I noticed two problems.
    1) The gun would fire multiple rounds on semi-auto
    2) The gun jammed almost every single shot
    I'm not sure if I messed something up when I went into the gearbox or some other issue as I'm fairly new to taking apart an M4 if you have any suggestions please let me know keeping in mind I don't know what the technical terms are for most parts or problems. Thank you