Читать книгу The Gun Digest Book of Tactical Weapons Assembly/Disassembly - J B Wood - Страница 9

Beretta PX4 Storm

Data:	Beretta PX4 Storm
Origin:	Italy
Manufacturer:	Armi Beretta S.p.A.,Gardone (Brescia)
Cartridge:	9 x 19mm (9mm Luger)
Magazine capacity:	17 rounds
Overall length:	7.55 inches
Height:	5.51 inches
Barrel length:	4.02 inches
Weight:	27.69 ounces

The polymer-frame PX4 was introduced in 2003. It has since been offered in other chamberings, including 40 S&W, and in a compact version. All of these are mechanically the same, and the instructions will apply. I will note that for the non-gunsmith, some aspects of the takedown and reassembly may be difficult.

Field Strip:

1. With the magazine removed and the hammer in cocked position, pull the tabs of the takedown latch down, and move the slide and barrel assembly forward off the frame.

2. Lift the barrel rotation block and remove it, along with the recoil spring assembly.

3. Turn the barrel slightly (counter-clockwise, rear view) to clear the locking lug, and remove it from the slide.

Detail Strip:

4. It is possible to dis-assemble the recoil spring unit by retracting the front ring and its collar and depressing the opposed catches of the endpiece. CAUTION: The compressed spring will be released. In normal takedown, this unit is not taken apart.

5. The extractor and its coil spring are removed by drifting out this vertical roll-pin. Control the spring.

6. Except for repair or refinishing, it is best to avoid takedown of the manual safety and firing pin system. If it is necessary, move the right-side safety lever very slightly to align its retaining rollpin with an exit track, and drift out the pin. This will allow the lever to be taken off, and the body and left lever of the safety, along with the rear firing pin, can then be turned and taken out to the left. The forward firing pin, the firing pin block, and their springs will then be accessible for removal.

7. Assuming that the manual safety system has been taken out, the firing pin and its spring are removed toward the rear, and the firing pin block, shown here, can then be removed, along with its spring.

8. Both the front and rear sights are dovetailmounted, and can be drifted out if necessary.

9. Use a sharp screwdriver to lift the back-strap retainer until it can be grasped and removed.

10. Remove the back-strap piece toward the rear. Some careful prying may be necessary to free it.

11. Push out the middle cross-pin at the rear of the grip-frame.

12. Be sure the hammer is in forward position, and push out the cross-pin at lower rear. CAUTION: Restrain the spring base, as the hammer spring will force it out.

13. Ease out the spring base and remove it.

14. Use slim pliers to grip the end of the hammer spring, turn it slightly to free it, and take it out.

15. This step is one of those that cannot be properly photographed. With the hammer in cocked position, look inside the top of the frame on the right, and use a fork-tipped tool like the one shown to push down the rear of the small rectangular locking spring. While holding it down, use another tool to nudge the tip of the top retaining cross pin toward the left. This slim pin passes through the hammer pivot, and its head is fully recessed into the grip frame on the left side. This is not an easy operation.

16. Remove the upper cross-pin toward the left.

17. With the hammer in forward position, move the rear sub-frame out upward. You will have to dis-engage it form the trigger bar as it exits.

18. If it is necessary to remove the firing pin block lever and sear-trip lever, push this cross pin out toward the left side. CAUTION: a small coil spring and positioning collar will be released, so control them.

19. The sear and its torsion spring can be removed by pushing out this cross-pin. CAUTION: Control the spring.

20. If the hammer is to be removed, you will have to once again un-latch the lock-spring. The hammer pivot is then pushed out toward the left side. The two-piece hammer spring strut is retained in the hammer by a small roll-pin.

21. Turn the trigger bar upward, and pull the trigger to align it with the exit recess in the frame. Move the bar to the right, and take it out. The trigger bar spring is in a recess inside the magazine well. A hooked tool can be used to remove it upward.

22. Drifting out this cross pin will release the trigger for removal downward. CAUTION: The torsion-type trigger spring will be released inside the frame at the top, so restrain it. In normal takedown, this system is best left in place.

23. If the takedown latch is to be removed, use a very slim tool inside the frame at the top, inserting it in the semi-circular opening at center to depress and hold the spring. The latch can then be taken out either side.

24. To remove the magazine catch system, first insert a small tool in the hole in the release button, and push the lock pin out toward the right side.

25. Remove the lock pin.

26. Remove the release button and spring toward the left.

27. Remove the magazine catch piece toward the right.

28. If the slide latch needs to be removed, turn it to its uppermost position, and nudge it out toward the left. CAUTION: Control the torsion spring.

Reassembly Tips:

1. As the rear sub-frame is re-installed, be sure the rear tip of the trigger bar is properly engaged before pushing the unit down into place. After the unit is seated, you must hold the trigger bar against the wall of the grip and use a fork-tipped tool to engage the upper arm of the torsion spring with its groove in the underside of the bar.

2. When installing the back-strap retainer, be sure its angled end is toward the front, as shown. A light tap with a non-marring tool will seat it properly.

3. Support the magazine release button on a firm surface as the lock pin is pushed back into place. The pin should be checked to be sure it is fully locked.