Читать книгу The Gun Digest Book of Firearms Assembly/Disassembly Part IV - Centerfire Rifles - J B Wood - Страница 12

Browning BAR

Data:	Browning BAR
Origin:	Belgium
Manufacturer:	Fabrique Nationale,
	Herstal, for Browning,
	Morgan, Utah
Cartridges:	243, 270, 280, 30-06,
	308, 7mm Remington Magnum,
	300 Winchester Magnum,
	338 Winchester Magnum
Magazine capacity:	4 rounds (3 in magnum)
Overall length:	43 and 45 inches
Barrel length:	22 and 24 inches
Weight:	7-⅜ and 8-⅜ pounds

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 double springs are quite strong. Remove the spring base, springs, guide rods, and the front base in the hammer.

17. Push out the hammer cross pin, and take out the hammer upward.

18. The magazine floorplate latch is retained in the receiver by a vertical roll pin, and this pin need not be drifted completely out to free the latch and spring. Just drift it upward enough to clear the latch, and take out the latch and spring toward the front.

19. A roll cross pin at the rear of the trigger group retains the safety plunger and spring. Restrain the spring at the top when drifting out the pin, and remove the spring and plunger upward. Remove the safety toward either side.

20. Move the bolt so the operating handle is accessible in the ejection port, and insert a small screwdriver to lift the handle latch outward. Move the handle forward, out of its recess in the bolt.

21. Move the operating handle to the wider opening in the bolt cover, and remove the handle toward the right. The latch and spring are retained in the handle by a very small cross pin, and are easily removed. In normal takedown, they are best left in place.

22. After the handle is removed, move the bolt assembly about half-way to the rear, bring it downward from the roof of the receiver, and take it out toward the rear.

23. Move the bolt cover to the rear of the bolt, and push upward on the right lower edge, tipping it over toward the left, and snapping its guide flange out of the groove on the bolt.

24. Drift out the cross pin in the rear tail of the bolt, and take out the firing pin and its return spring toward the rear. The ends of the cross pin are contoured with the bolt tail, and care should be taken not to deform the ends.

25. Push the cam pin upward out of the bolt sleeve, and remove it.

26. Move the bolt forward out of the bolt sleeve.

27. Drifting out the vertical pin on the left side of the bolt carrier will allow removal of the timing latch toward the left. The pin must be removed upward.

28. The ejector is retained at the front of the bolt by a vertical pin. Caution:Restrain the ejector, and ease it out after the removal of the pin, as the ejector spring is compressed.

29. Use a small screwdriver to push the extractor spring up out of its groove, and remove the spring toward the rear.

30. After the spring is removed, the extractor can be moved downward, into the bolt face recess, and is taken out toward the front.

Reassembly Tips:

1. When replacing the bolt in the bolt carrier, be sure the flat between the bolt lugs is on top, and the extractor and ejector at upper left and lower right (front view).

2. When replacing the cam pin in the bolt and sleeve, the small hole at the center of the cam pin must be oriented properly for passage of the firing pin.

3. When replacing the bolt in the receiver, the blot must be at its forward position in the sleeve, to allow the timing latch to be retracted.

4. When replacing the gas piston, note that there is a guide pin at the lower rear of the gas cylinder, and the piston must be oriented so its rear groove will mate with the pin.