The Gun Digest Book of Tactical Weapons Assembly/Disassembly. J B Wood
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29. After the magazine release is taken out, the trigger is free to be removed toward the rear of the frame. The grip screws can be taken out to free the grips.
Reassembly Tips:
When installing the combination spring, slide the mainspring housing partially into the frame to hold the spring in place while replacing the grip safety.
During reassembly, the most difficult operation is often the alignment of the barrel link with the slide latch hole in the frame. The hole is large enough that the proper alignment can be seen, and the link can be edged into position by moving the slide back and forth a very small distance until it drops into place. Don’t try aligning the link and the clearance cut for the top of the latch at the same time. Get the latch shaft through the link, then swing the latch up and align it with the clearance cut.
FNH Five-Seven
| Data: | FNH Five-seven |
| Origin: | Belgium |
| Manufacturer: | Fabrique Nationale,Herstal |
| Cartridge: | 5.7 x 28mm |
| Magazine capacity: | 20 rounds |
| Overall length: | 8.2 inches |
| Barrel length: | 4.8 inches |
| Weight: | 23.3 ounces |
The Five-seveN has also been called the IOM (Individual Officer Model), and USG (U.S. Government). The latter designation indicates its use by several agencies. When the pistol was introduced, original ammunition would pierce body armor, and sales were to Law Enforcement only. Later, with different cartridges and a slight re-design, it was offered for regular commercial sales.
Field Strip:
1. With the internal hammer in fired position and the magazine removed, move the slide about a quarter-inch rearward, and hold it there. Push the takedown latch fully to the rear, and keep it in that position.
2. Ease the slide assembly forward about a half-inch, to clear the rails at the rear, and lift it off the frame.
3. Tip the barrel outward at the rear, and remove it from the slide, along with the captive recoil spring.
FNH Five-Seven field-stripped
Detail Strip:
4. It is possible to remove the recoil spring and it’s bushing from the barrel by retracting the bushing and spring, then prying off the retaining spring-ring. A vise and extreme caution will be necessary. In normal takedown, this system is left in place.
5. The slide components are contained in a subframe that is retained in the cover by this cross pin. It is splined at its right tip, and thus must be drifted out toward the right side. Be sure to use a non-marring brass drift punch.
6. Use a tool to gently pry the rear of the subframe outward slightly, as shown.
7. When the rear sight has cleared its opening in the cover, push the front sight inward and rearward, to detach the front lug of the sub-frame from its seat in the front of the cover. This will be visible at the front. Remove the sub-frame from the cover.
8. During the sub-frame removal, take care that the loaded-chamber indicator and its small coil spring are not lost. It would probably be wise to remove them at this point.
9. To remove the extractor and its coil spring, depress the extractor slightly at the rear and pull out the pivot pin. Control the spring.
10. Remove the cross pin at the rear of the subframe. It can be simply pushed out, no tool required.
11. Remove the firing pin and its return spring toward the rear.
12. If removal of the firing pin safety block and its spring is necessary, these parts can be taken out only upward, and you must first drift the rear sight assembly out of its dovetail-mount. Except for repair, this system is best left in place. This also applies to disassembly of the rear sight. If necessary, the front sight can be drifted out of its dovetail-mount.
13. Unless replacement is necessary, the action locking block and the other forward components should not be removed. If this has to be done, the locking block cross pin is drifted out toward the right. It is under slight spring tension, so control it. If the strong barrel rebound spring must be removed, it will be necessary to insert a spacer of some sort to hold the spring while the cross pin is drifted out toward the right. CAUTION: This spring is very powerful. If the parts above have been removed, the takedown latch can be moved rearward, its rear extension turned upward, and it is then moved inward to be taken out.
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