from the above link:
CETME rifles, like their G3 cousins, disassemble from the rear. The two pins are
pushed out of the bottom of the buttstock where it attaches to the receiver, and the
butt can then be withdrawn to the rear, taking the operating spring and guide rod with
it. The pistol grip and trigger pack should then either fall off or be easily removed. At
this point, the muzzle can be raised and a rearward tug on the cocking handle should be
sufficient to send the bolt and bolt carrier group out the rear of the receiver.