Читать книгу The Gun Digest Book of Firearms Assembly/Disassembly Part IV - Centerfire Rifles - J B Wood - Страница 14

Calico Model M-900

Similar/Identical Pattern Guns

The same basic assembly/disassembly steps for the Calico Model M-900 also apply to the following guns:

Calico Model M-951-S

Calico Model M-951 Tactical Carbine

Data:	Calico Model M-900
Origin:	United States
Manufacturer:	Calico, Inc.Bakersfield, CA
Cartridge:	9mm Parabellum
Magazine capacity:	50 or 100 rounds
Overall length:	28-½ inches(34-½ inches with stock extended)
Barrel length:	16 inches
Weight:	3.7 pounds

In 1986, the California Instrument Company introduced a 22 rim-fire semi-auto rifle, the Model 100, that had a unique helical-feed magazine with a capacity of 100 rounds. By 1989, the centerfire version was ready, in 9mm Parabellum, with 50-round and 100-round magazines. The M-951-S and M-951 Tactical Carbine are mechanically identical. There is also a handgun version, the Model M-950. The bolt is roller-locked, in a manner similar to the Heckler & Koch guns.

Disassembly:

1. Remove the magazine. Pull the stock out to the opened position, operate the stock latch again, and remove the stock toward the rear.

2. Pull the trigger to drop the striker to fired position. Push out the large cross pin just below the cocking handle. If it is installed left-to-right, the handle must be moved back slightly to clear it.

3. Remove the forend toward the front.

4. Move the pistol grip unit straight toward the rear for removal.

5. Lift the cocking handle out of its recess at the rear, and remove the handle and its spring toward the front.

6. Push the bolt assembly slightly to the rear from inside the feed opening at the top, and remove it downward.

7. Alternately retract the bolt springs, keeping them under control, and move the ends of the guide rods out of their slots in the recoil buffer assembly. Caution: Control the springs, and ease the tension slowly.

8. Remove the buffer assembly, and the striker spring and its guide, from the bolt. It must be turned to clear.

9. Remove the bolt springs toward the rear.

10. Remove the striker toward the rear.

11. The firing pin is retained by a roll-type cross pin. After removal of the pin, the firing pin is taken out rearward.

12. With the locking rollers aligned with an access cut in the lower frame of the bolt, push out the extractor cross pin.

13. Remove the bolt head toward the front.

14. The extractor and its coil spring are now freed for removal from the underside of the bolt head.

15. The locking rollers are retained by vertical roll pins in blind holes, and routine removal is not possible. If replacement is necessary, the unit must be returned to the factory.

16. Removal of the trigger group from the pistol grip requires the removal of two Phillips screws. One is located inside the hollow grip, and the other is located at the front, inside the ejection port.

17. After the two screws are removed, lift the trigger group gently at both ends, and take it out upward. The safety must be in the on-safe position during this operation.

18. Note the position of the disconnector spring in the underside of the trigger unit, as it must be restrained as the trigger pin is removed.

19. Restrain the spring, and push out the trigger cross pin. The spring will be released for removal.

20. The trigger can now be moved forward, and the safety slide plate can be taken off.

21. Move the trigger and its attached return springs forward, along with the disconnector, and take them out of the unit.

22. Restrain the sear at the top, and push out the sear stop pin.

23. Ease the sear over rearward, releasing the tension of its spring, and push out the sear cross pin. Remove the sear and its spring upward.

24. The safety-levers, the cross piece and the positioning spring can be removed by taking off the C-clips on each side inside the housing. The levers are then taken off toward each side, the cross shaft is taken out, and the safety cam and spring are removed upward.

25. If the magazine has to be disassembled, be sure to first push the clutch button to release the spring tension. Slide the top ribbon clamp off toward the front, as shown.

26. Slide the bottom ribbon clamp off toward the rear.

27. Separate the two parts of the magazine housing.

28. Remove the magazine follower from the housing.

29. Take care that the front washer is not lost during disassembly.

30. If necessary for cleaning, the feed lip, its twin coil springs, and the spring base can be moved out of the housing end piece toward the rear.

31. The fluted cartridge carrier can be removed for cleaning, but disassembly of the drive spring unit in the rear end piece is not recommended.

Reassembly Tips:

1. When replacing the trigger and disconnector in the trigger unit, insert the cross pin half way, and use pliers to position the disconnector spring for passage of the pin through its loop.

2. If the safety system has been disassembled, be sure the longer cross arm of the positioning spring is at the rear, as shown. The front tab of the safety slide (“sear block”) must go between the cross arm of the spring and the cam.

3. To reinstall the extractor, its spring, and the bolt head, insert a tool from the front to lift the extractor, and use a small drift from the side to position the parts for insertion of the cross pin. Be sure the pin is properly centered in the unit.

4. When the stock is replaced, the loop of the latch spring must be flexed outward, so that it bears on the left bar of the stock as it is inserted.