Ozhunter,

The rear sight base is sleeved and soldered to the barrel.
It bears a recoil lug that seat in the forend.
The "detachable stock" follow the H&H pattern; we machine the rear of the action to fit on monobloc piece secured at the rear of action.
To take the rifle apart, you have to unscrew the modified captive large head front bolt and lift the barrel to "un-wedge" the rear of action.
That can be dome with a coin or a cartridge rim, even if each rifle is delivered with a special turnscrew.
Some photos to clear my fuzzy explanation.

DORLEAC
www.dorleac-dorleac.com