Dissasemble Body of M4 CQB

This is a basic disassembly guide for the M4 Commando. I have the CQB-OPS model, but most of this information should still be relevant. Steps in parenthesis are optional and are not necessary to access the gearbox.

The RAS/ Battery Compartment (Commando series only)

1. Remove the battery
2. Remove the two battery compartment screws, and then push the two "open" buttons and remove the lower section of the RAS.
(3). If you look at the inside, you should be able to see a piece that clamps the upper RAS to the outer barrel. Remove the two screws and take the clamp piece off. You should now be able to remove the upper RAS by lifting and sliding it away from the delta ring.
(4). Using a small hex key, loosen the small screw underneath the orange flash hider. Turn the flash hider "right" to loosen it. (It's "reverse threaded").
(5). Loosen the screws that hold the gas block (the RAS section that the front sight attaches to). You can now slide this piece off without totally removing the screws.

The Stock (optional) (Folding stock only)

(1). Fold the stock
(2). Loosen the ring (roughly 1 in in diameter) that is closest to the body of the gun. (this ring should be snugged with the body of the gun when re-assembled)
(3). Remove the bolt in the main body of the gun (just above the pistol grip) that attaches the pivot-joint to the body.
(4). Close the pivot joint
(5). loosen the second ring (should be snugged against the pivot-joint) and loosen the small screw at the bottom of the pivot joint.
(6). unscrew the telescoping stock from the pivot-joint

The Body

1. Near the front of the gun you will notice wiring zip-tied to the outer barrel. You will notice a black plastic cylinder on the top: this contains the fuse. You should also notice two parts of the wiring that look shrink-wrapped. These are actually connectors. They must be detached, just pull them apart. Cutting the zip ties should not be necessary.
2. Once the wires are detached, unscrew the main body pins, starting with the one closest to the muzzle. Use a flathead screwdriver.
3. The first pin (closest to the muzzle) should come out without much trouble. The second pin is a little more tricky. Use the first pin to tap out the second pin with a screw driver. It won't give at all at first, but then it should come out smoothly.
4. Once the pins are removed, begin sliding the upper receiver away from the lower receiver. It should catch. Grab the charging handle, pull it back, and lift. you should now be able to slide the upper receiver off. Be careful to note where the two wires you detached earlier slide through the base of the delta ring, you'll need to feed them back through for reassembly.