The Gun Digest Book of Firearms Assembly/Disassembly Part IV - Centerfire Rifles. J B Wood

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      The factory designation of this gas-operated semi-auto sporter has caused a little confusion, as the famed military selective-fire gun was also called the “BAR.” The sleek sporting rifle was introduced in 1967, and it is still in production. The gun has been offered in several grades, the price depending on the extent of stock checkering, carving, engraving, and inlay work. Regardless of the grade, the mechanical details are the same, and the instructions will apply.

      Disassembly:

      1. With the empty magazine in place, pull back the cocking handle to lock the bolt in open position. With a small wrench or a pair of smooth-jawed pliers, unscrew the front sling swivel base on the underside of the forend near the forward end.

      2. Tip the front of the forend downward until firm resistance is felt, then move it forward and off. Do this carefully, and use no extreme force, or the forend will be damaged.

      3. Slide the right and left action rod support rails out of the receiver toward the front, and remove them.

      4. Disengage the forward ends of the action bars form the studs on the sides of the inertia block, and take the bars out toward the front.

      5. Remove the gas regulator from the front end of the gas cylinder. A ⅝”-inch open-end wrench will fit the side flats of the regulator, and it is simply unscrewed. Be sure the wrench is properly engaged to prevent marring. Take care not to lose the lock washer behind the gas regulator.

      6. Remove the gas piston toward the front. If the piston is very tight, it may have to be nudged from the rear with a drift punch. If this is necessary, be very careful, as any burrs raised will cause the system to malfunction. If the piston won't move with the use of reasonable force, soak it for a time in a good powder solvent or penetrant.

      7. Firmly grip the action spring guide at the rear, and lift its rear tip out of its seat in the front of the receiver. Remove the guide, spring, and inertia block toward the rear. Caution: Keep a firm grip on the partially compressed spring, and ease it off.

      8. Open the magazine floorplate, and insert a small screwdriver at the rear of the magazine to pry it away from the floorplate. Remove the magazine from the floorplate.

      9. The magazine retaining spring is mounted on the end of the floorplate by a cross pin, and is easily removed. the floorplate is attached to the receiver by a cross pin, and the floorplate spring is mounted around the pin. Restrain the spring when drifting out the cross pin, and remove the floorplate downward.

      10. Remove the buttplate to give access to the stock mounting bolt. Use a B-Square stock took or a long screwdriver to remove the stock mounting bolt, and take off the stock toward the rear. If it is very tight, bump the front of the comb with the heel of the hand to start it.

      11. Insert a drift punch into the hole in the stock mounting plate at the rear of the receiver, and lift the plate upward, then tip it and remove it toward the rear.

      12. Slide the trigger group out of the receiver toward the rear.

      13. Restrain the hammer, pull the trigger, and ease the hammer down to the fired position. Drift out the trigger cross pin.

      14. Remove the trigger and the attached disconnector upward, and take out the disconnector spring and its plunger. The cross pin that joins the disconnector to the trigger is riveted in place, and should be removed only for repair or replacement purposes.

      15. Push out the sear cross pin, move the sear forward, then remove it upward.

      16. Insert a screwdriver behind the base for the twin hammer springs and lever it forward and upward, out of its seats in the trigger group. Caution:Grip the ends of the base firmly during this operation, and control its movement, as the semi-compressed СКАЧАТЬ