PLEASE NOTE that the rifle used for these images is a deactivated one, so some of the pictures will show little differences (absence of firing pin and soldered firin pin hole in the bolt head).

We'll begin the reassembly by placing the firing pin (not shown) followed by its spring into its place in the bolt carrier.

Then, we'll slip in the firing pin carrier...

Note the upperside position of the protrusion on the firing ping carrier, that holds the piece in its place and prevents it from being incorrectly inserted.

... and we'll fix it in place by a 90° clockwise twist.

It will be hold in place by a little protrusion.

Do not expect a click, as the carrier is held in place by the firing ping spring forcing the protrusion against the inner side of the bolt carrier. However, let it rest horizontal to avoid problems when inserting the lock head.

Now, we'll insert the lock head...

Note that the head is to be inserted facing upside down.

Note also that the locking rollers are now free.

... until it rests against the face of the bolt carrier...

Now the planes of the firing pin carrier will force the locking rollers to protrude.

... and give it a 180° clockwise twist to lock it into place.

Again, you can need to use the sling to help you to turn the bolt head.

Now, we'll have the bolt head locked in its place and ready to be inserted again in the barrel assembly.

Note that the locking rollers are protruding again.

We'll place back the fire assembly and lock it with its pin.

A little click will show that the pin has been locked in place.

But right now we have a little problem, as the protruding locking rollers won't allow the bolt assembly to slide into place.

Then, remember your old Jedi master: "Use the Force".

So, without further hesitation, we'll grip the bolt assembly by its guide and we'll gently ram it backwards into the barrel assembly...

... thus forcing back the locking rollers ...

This will also force forwards the lock head.

Please do not worry - this is the way it's intended to work, and you're not submitting the rifle to an undue stress.

... and extracting the bolt assembly ready to be inserted.

Now, we'll turn the bolt assembly facing forwards, insert it into the barrel assembly ...

... making sure it fits into the assembly ...

... and give it a final push ...

... to help it all the way down the barrel assembly.

If the lock assembly doesn't go all the way forwards, the fire assembly won't lock into the barrel assembly. Make sure the cocking handle is in its forfward position.

Now, we'll push closed the fire assembly ...

... held it in place ...

... and place the buttstock assembly to secure it.

We'll slide forwards the buttstock assembly...

... take the pins from their hole in the buttstock...

... and put them back in place, thus locking the butsstock assembly.

Now, we'll pull the cocking handle to make sure all works nicely.

We have now a fully assembled and working rifle.