Quote:
Originally Posted by Styrak
Kind of related, how did you go about installing a mosfet with the upper/lower wireless contact system?
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It was a challenge due to the limited space! Basically, the mosfet only has one integrated signal (trigger wire), so there is one less wire to run.
1) Mosfet sits in hand guard near the back under the barrel (before the stock fuse).
2) You have to run the signal wire (blue) to the bottom trigger contact. This is done by carefully pushing it through the slot where the positive and negative wires exit the top receiver (barrel). I.e. insert it from the hand guard towards the back. I had to remove the barrel (single large Phillips-head screw in mag well) to get this cable to enter the hop area. Smaller cables will enter without removing the barrel. Pull the cable out as far as you can so you have slack (mine was 0.5 m long).
3) Unsolder the positive wire that runs from the motor to the bottom contact on the trigger. Take pictures beforehand so you can route your wires correctly later.
4) Solder a new positive wire to the top of the positive contact on the lower receiver - above the second positive wire that runs to the trigger contact. This wire must run to the front of the mechbox and then wrap around it and then run along the right side of the mechbox back to the motor. See photo. This is the most challenging part: getting the new wire soldered without unsoldering the other one below it.
5) Solder the blue wire to this trigger contact as shown in the photo. Run the wire as shown.
6) Run the wires as shown. When reassembling, join the upper and lower receivers while gently pulling the excess blue signal wire back out into the hand guard. The wire will run below the hop unit, crossing in front of it. Be careful not to pinch it when closing the upper and lower receivers.
Once finished, simply retain the excess length of the blue cable by bundling it carefully (I taped mine with electrical tape) out of the way in the hand guard. When you want to disassemble the gun, simply undo the blue signal wire bundle (remove the tape), separate the upper and lower a little and then pull the wire back into the upper as you separate the two parts of the receiver. They are still attached by the blue wire, but there is enough excess wire with 0.5 m to work on the two halves or you can unsolder the blue wire easily enough to fully separate them.
-> Note that you are retaining the second, short, positive wire that runs from the trigger to the contact on the lower receiver. This is your second trigger or signal wire that needs to be run to the positive wire.
It works perfectly. (Except the overcycling in my case).