No licence is required to purchase a deactivated gun. A deactivation certificate is supplied with every deactivated gun. All the deactivated guns listed above conform to the EU Regulation 2018/337, 5th March 2018.
How are firearms deactivated to the new specification?
For military rifles, and with bolt action rifles in general, the barrel is blocked, pinned and cut. The bolt face is ground away at an angle along with the firing pin. The bolt can move within the gun, but cannot be removed. The trigger may move, but there will be no connection between it and the bolt, so the gun will not cock or dry fire.
For shotguns, the barrel is blocked, pinned and cut. The action will break, but the barrels and fore end will not remove from it. The triggers may move, but they will not cock the action, and it cannot be dry fired. On hammer guns, the hammers may move under spring pressure but will not cock or dry fire.
Revolvers must have the cylinder filled with weld, and cut on the inside, with the barrel being pinned, welded and slotted underneath. The cylinder may rotate, and the hammer move, but there can be no connection between the hammer and the trigger, the revolver will not cock or dry fire.