Читать книгу The Gun Digest Book of Firearms Assembly/Disassembly Part IV - Centerfire Rifles - J B Wood - Страница 15

Colt AR-15

Similar/Identical Pattern Guns

The same basic assembly/disassembly steps for the Colt AR-15 also apply to the following guns:

Colt AR-15 Collapsible Stock Model

Colt AR-15A2 Carbine

Colt AR-15A2 HBAR

Colt AR-15A2 Government Model Target

Colt Sporter Lightweight Rifle

Colt Sporter Match Delta HBAR

Eagle Arms EA-15

Olympic Arms AT-15 Service Match

Colt AR-15A2 Sporter II

Colt AR-15A2 Delta HBAR

Colt AR-15 Delta HBAR Match

Colt AR-15A2 Government Model Carbine

Colt Sporter Target Model

Colt Sporter Match HBAR

Olympic Arms AR-15 Heavy Match

Olympic Arms CAR-15

Data:	Colt AR-15
Origin:	United States
Manufacturer:	Colt FirearmsHartford, Connecticut
Cartridge:	223 Remington (5.56mm)
Magazine capacity:	5 and 20 rounds
Overall length:	38-⅜ inches
Barrel length:	20 inches
Weight:	7-¼ pounds

The original AR-15A1, made from 1963 to 1984, did not have the bolt forward-assist plunger and spring on the right side of the receiver, as on the M-16 military gun. All AR-15A2 rifles, up to the present, have this feature. The plunger is retained by a pin, and removal is a simple operation that will require no additional instructions.

Disassembly:

1. Remove the magazine, and cycle the action to cock the hammer. Push out the takedown pin, located at the upper rear of the grip frame, toward the right.

2. With the takedown pin stopped in pulled-out position, tip the barrel and receiver assembly upward at the rear.

3. Use the charging handle to start the bolt assembly toward the rear, and remove the assembly from the rear of the receiver.

4. Move the charging handle to the rear until it stops, then move it out the rear of the receiver.

5. The charging handle latch and its spring are retained in the handle by the vertical roll pin. In normal takedown, it is best left in place.

6. Use a small tool to pull out the cotter pin on the left side of the bolt carrier, to free the firing pin.

7. Remove the firing pin toward the rear.

8. Rotate the bolt cam pin to clear its flange from beneath the edge of the overhang, and remove the bolt cam pin upward.

9. Remove the bolt from the front of the bolt carrier.

10. The extractor and its coil spring are retained in the bolt by a cross pin which is easily pushed out in either direction.

11. The ejector and its spring are also retained by a pin, a small roll pin that crosses the front of the bolt. The ejector spring is quite strong, so restrain the ejector during removal.

12. The gas cylinder is retained by two Allen screws on top of the bolt carrier, and these are heavily staked in place. CAUTION: This unit should be removed only if repair or replacement is necessary.

13. Remove the cap screw at the left end of the receiver pivot. It will be necessary to stabilize the screw-slotted head of the pivot with another large screwdriver on the right side during removal.

14. Use a slim drift punch that will not damage the interior threads to nudge the receiver pivot out toward the right, and separate the barrel and receiver unit from the stock and grip frame assembly.

15. Pull back on the grooved slip ring right at the rear of the handguard units, and alternately tip each unit outward at the rear, then remove them rearward.

16. With a wrench of the proper size, unscrew the flash hider from the end of the barrel, and take care not to lose the lock washer behind it.

17. The combination front sight base, gas port unit, and bayonet mount is retained on the barrel by two large cross pins. When these are drifted out toward the right, the unit can be nudged forward off the barrel. During removal, take care that the gas transfer tube is not damaged.

18. The gas conduit is retained in the sight unit by a roll cross pin. In normal takedown, this should not be disturbed.

19. Insert a small tool in one of the holes at the top of the large clip-ring at the front of the receiver, and gently pry the ring out of its channel. Moving it rearward will relieve the tension of the circular spring assembly that powers the handguard slip-ring.

20. Move the slip-ring to the rear to give access to the toothed barrel retaining nut, and unscrew the nut counter-clockwise (front view). Take off the retaining nut, slip-ring, spring, and clip-ring toward the front.

21. The long pin which forms the hinge for the ejection port cover is retained by a C-clip in a groove near its forward end. Take off the C-clip, and move the hinge pin out toward the rear. Caution: The cover spring will be released as the pin is cleared, so restrain it. Take care that the very small C-clip is not lost.

22. Restrain the hammer and pull the trigger to lower the hammer to fired position. Push out the hammer pivot pin toward either side, controlling the hammer against its spring tension.

23. Remove the hammer and its spring upward. The spring is easily detached from the hammer.

24. Push the trigger pin just far enough toward the right that the disconnector is cleared, and remove the disconnector from the top of the grip frame.

25. Set the safety halfway between its two positions, and use a nylon drift punch on the right side to nudge it toward the left, then remove it

26. Remove the trigger pin, and take out the trigger assembly upward. The trigger spring and disconnector spring are easily detached from the trigger.

27. The magazine catch is removed by pushing it toward the left beyond its normal magazine release point, then unscrewing the catch piece from the button. The button and spring are then take off toward the right, and the catch piece toward the left. The catch piece is unscrewed counterclockwise, left-side view.

28. The hold open device and its spring are retained on the left side of the grip frame by a roll pin, and after removal of the pin they are taken off toward the left.

29. Restrain the recoil buffer against the tension of the recoil spring, and depress the buffer stop plunger. Caution: The spring is strong, so take care to keep it under control.

30. Slowly release the tension of the spring, and remove the buffer and spring toward the front.

31. Remove the upper screw in the buttplate and remove the buttstock toward the rear. Take care not to lose the takedown pin retaining plunger and its spring at the rear of the grip frame. Removal of the lower screw in the buttplate will give access to the mechanism of the storage compartment cover and its latch.

32. Remove the takedown pin spring and plunger from the rear of the grip frame. The takedown pin can then be removed toward the right.

33. The pistol grip is removed by backing out a screw accessible through the bottom of the grip. Note that this will also release the safety plunger and its spring for removal downward.

34. The lower section of the trigger guard is retained at the rear by a roll cross pin. After this is removed, the section can be swung downward, and a very small roll pin in its forward hinge will be exposed for removal. The hinge pin can then be taken out toward the right, and the lower section removed.

Reassembly Tips:

1. When replacing the safety-lever, use a tool on the right side to depress the safety plunger as the safety is pushed into place.

2. When replacing the cocking handle, remember that its forward end must be inserted into the receiver and then moved upward into its track.

3. When replacing the bolt in the bolt carrier, note that the extractor must be oriented to the upper right, and the ejector to the lower left. Also, remember to turn the bolt cam pin so its flange is beneath the edge of the gas cylinder.