The Gun Digest Book of Firearms Assembly/Disassembly Part V - Shotguns. J B Wood

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      Introduced in 1975, this sleek autoloader was Browning's first entry in the field of gas-operated shotguns. While all guns of this type have operating systems that are somewhat similar, the B-2000 gas mechanism has some different features, including a valve that regulates the ported gas, allowing the use of a wide range of loads. For those who are accustomed to the large and simple parts of the venerable Auto-5, the takedown may have some surprises. There is an inter-dependence of small parts, and the amateur should proceed with caution.

      Disassembly:

      1. Pull back the operating handle to lock the bolt in the open position, and set the safety in the on-safe position. Unscrew the magazine end cap, and remove it. Take off the barrel and forend toward the front, and remove the forend from the barrel toward the rear.

      2. Restrain the gas piston at the front of the magazine tube, and push out the gas piston bar toward either side. Caution: The piston is under spring pressure, so control it and ease it out.

      3. Slowly release the spring tension, and remove the gas piston assembly and its spring toward the front.

      4. Remove the gas cylinder plug from the front shaft of the gas piston valve.

      6. Remove the gas pislon valve toward the rear..

      7. Restrain the bolt, operate the carrier latch, and ease the bolt forward to the closed position. With a non-marring tool, push out the trigger group retaining cross pin toward either side.

      8. Move the bolt about 1-1/2 inches toward the rear, depress the carrier latch, and move the guard unit a short distance toward the front. Tip the front of the trigger group slightly downward, ease the bolt back forward, and remove the trigger group from the bottom of the receiver.

      9. Restrain the carrier, and push out the carrier pivot pin.

      10. Remove the carrier upward. Note that the carrier dog and its plunger and spring are retained on the rear arm of the carrier by a cross pin that is heavily riveted in place, and removal is not advisable unless necessary for repair.

      11. Remove the carrier spring from its recess on the right side of the trigger group.

      12. Move the safety to the off-safe position, restrain the hammer, pull the trigger, and ease the hammer down to the fired position. Place a thumb on top of the twin hammer springs to restrain them, and push out the hammer pivot pin toward the left.

      13. Move the hammer upward until its spring base pin climbs over the edge of the front projection of the guard unit, relieving the spring tension. Remove the hammer, springs, and guides upward. The spring system is easily removed from the hammer.

      14. Removal of the hammer pivot pin will have freed the shell stop spring. Insert a small screwdriver to lift it out upward, and remove it.

      15. Remove the cross pin that is the rear base for the twin hammer springs toward either side.

      16. Drift out the small cross pin at the upper front of the trigger group, using a punch of very small diameter. Restrain the carrier latch assembly as the pin is removed.

      17. Remove the carrier latch assembly, and its spring and plunger, toward the front. The carrier latch trip can be separated from СКАЧАТЬ