SG 552-1 Commando Gearbox Replacement

Using a flathead screwdriver, remove the pin holding the hand guard in place.

• To remove this, turn the pin clockwise and push it through at the same time.

Remove the hand guard.

Using a Phillips #1 screwdriver, remove the two 8mm screws above the hand guard on both sides of the gun.

• There should be four total.

Turn the gun over so that you are facing the bottom of the gun.

• Using a Phillips #1 screwdriver, remove the following screws:

  • Remove the 8mm screw that is located directly underneath the cocking lever.
  • Remove the 8mm screw located beside the screw you just removed.

Carefully tug on the tip of the gun and pull the barrel and its cover out.

Locate the hand grip.

Using a Phillips #0 screwdriver, remove the two 6mm screws at the bottom of the hand grip.

Slide the cover off.

Pull the motor out of the hand grip.

Using a Phillips #1 screwdriver, remove the two 5mm screws inside of the hand grip.

Locate the pin holding the folding stock in place.

Using an allen wrench or something small, carefully push the pin out.

Using a Phillips #1 screwdriver, remove the 20mm screw behind the folding stock and above the gearbox.

Remove the cover that was held on by the screw.

Using a flathead screwdriver, remove the two 5mm screws beside the safety switch on both sides of the gun.

Slide off the piece that was held on by those screws.

Using a small allen wrench, carefully unscrew the screws holding the safety switch in place on both sides of the gun.

• The screws do not have to be taken out all the way, just slightly loosen them until you are able to pull the switch off.

Using a Phillips #0 screwdriver, remove the two 6mm screws that were underneath the safety switch on both sides of the gun.

Carefully remove the pieces that were held on by the screws.

Pull apart the cover when pulling the gearbox out.

Pull the gearbox out.

• The gears will fall out when taking the gearbox out. Careful not to lose them.