The extractors (j), one on either side, lie flat against the rear face of the tube of the gun and in recesses in the front face of the block. They revolve on pivots which work in recesses in the curtain. The rear sides of the tails of the extractors and the lower front corners of the breech-block form cam surfaces so arranged that when the block rotates to the rear the extractors extract and eject the cartridge-case.
The spring lock on the handle prevents the main bolt and block from moving, when the breech is closed, under stress other than that applied directly to the handle.
TO DISMOUNT.
1. Back out the guide-bolts far enough to clear the guide-grooves. 2. Half-cock. 3. Take off handle. 4. Tap the main bolt gently to start it and withdraw it completely, supporting the block with the hand. 5. Lower the block out of place, tilting it slightly to the rear so as to clear the extractors.
THE BREECH-BLOCK BEING OUT, TO TAKE THE MECHANISM APART.
1. Full-cock the firing-pin before removing the face-plate. 2. Remove face-plate. 3. Ease firing-pin forward and remove finger-catch. 4. Take out main cam, firing-pin, and spring. 5. Push sear-plug in a little, turn it until the stud is fair for coming out, and remove it and the sear and spring.
TO ASSEMBLE THE MECHANISM.
Proceed in the reverse order. Put in successively the firing-pin spring, the firing-pin, and the main cam. The front side of this cam is marked "out." The firing-pin must be full-cocked before putting on the face-plate and then let down to half-cock. An arrow on the head of the main bolt being brought in line with the arrow on the curtain indicates the proper "square" for the hexagonal bearing in the cam.