These pictures where taken in reverse order, as I normally store the weapons in a "deactivated" state.
Lift the feed cover by pressing the catch forward
On the underside, there is a catch directly behind the grip. Press this and give the stock a 90 degree twist.
Pull the stock caerfully back, taking care not to bend the recoil spring.
"Cock" the bolt by twisting the two ends so that the guide wheels are aligned the with flared guides on the back. Insert the end with the wheels first.
Re-insert the spring holding the trigger down to allow the bolt to go completely forward. Replace the stock and close
For completely disassemble, remove the bolt by reversing the above steps.
To remove the bolt, you need to unlock the cocking handle from it's forward position.
While pressing frimly on the catch located under the barrel shroud, pull the cocking handle back.
Remove the receiver cover by pressing the holding bar in, lift the cover 45 degrees and pull back.
Unscrew the head of the locking bar and lift the feed tray off the receiver.
Holding the barrel release catch in swing the receiver down.
On the right side of the barrel shroud is the locking stud that holds the receiver in place. With the receiver twisted to the side, press the stud in and pull the receiver back.
Pull the cocking handle as far back as it will go.
Press the same catch that detaches the stock and lift the cocking off the receiver.
To remove the muzzle cone, lift the locking bar and un-screw.
View of the muzzle showing the flash suppressor, recoil booster and barrel shroud.
Disassembled receiver
Disassembled Barrel, bolt, cocking handle, recoil spring and bolt
Close up of the bolt in an "cocked" state.
Close up of the bolt in the fired state.
The Bolt of the MG-34 actually locks directly with the barrel allowing the design of a "quick change" barrel system. You can see that the bolt head clears the receiver and the locking lugs on the bolt.
The wheels on the bolt head follow the "ramp" on the barrel locking the bolt at the time of firing.