The Gun Digest Book of Rimfire Rifles Assembly/Disassembly. J.B. Wood
out against the fingertip.
15. Use a magnet or a magnetized tool to remove the detent ball, and take out the spring.
16. Remove the safety catch toward the rear.
17. Drift out the trigger stop cross pin toward the right.
18. Drift out the trigger cross pin toward the right.
19. Move the trigger assembly downward and toward the rear for removal.
20. The sear trip, or “rebound lever,” to use the factory term, is pivoted and retained on the trigger by a cross pin. In normal takedown, this is best left in place. If it is removed, the small ball bearing and spring that power the trip will be released. Caution: Control these parts.
21. Remove the trigger spring and plunger from inside the housing at the rear.
22. Remove the rear housing retaining screw, located inside the housing, just forward of the trigger spring. Take care that the washer isn’t lost.
23. Remove the large retaining screw at the front of the housing, along with its lock washer.
24. Remove the trigger group housing from the action.
25. Because the trigger housing is made of alloy, and the parts are steel, further disassembly should be done only if repairs are necessary. We will show the sequence here, without actual removal of the pins and parts. To remove the magazine catch, first drift out the stop pin.
26. Drift out the magazine catch pivot pin toward the right. Caution: Insert a shop cloth in the magazine well to catch the released spring.
27. Drift out the sear stop pin. Restrain the sear as the drift is removed and ease it upward.
28. Drift out the sear spring retaining pin, and remove the sear spring downward.
29. Drift out the sear pivot pin and remove the sear upward. Again, note that while we have shown the sequence here, the parts are still in place.
30. The stock mounting stud can be drifted out of its dovetail if necessary. However, note that it is factory-staked in place. In normal takedown, it is not removed.
31. The front sight is retained by a small Phillips-type screw. The rear sight is a dovetail mount, and it is drifted out toward the right.
32. The barrel is retained by a large cross pin. In normal takedown, the barrel is not removed.
Reassembly Tips:
1. When installing the cross pins in the trigger housing, remember that they have splined heads and must be inserted from right to left. Be sure the trigger spring plunger engages its shelf at the rear of the trigger before the pin is installed.
2. When replacing the bolt, remember that the striker must be positioned for insertion of the bolt handle. As the bolt is moved forward, insert a small drift in the hole in the sear trip, and tip it to the rear to disengage it from the sear. Directions for this are also embossed on the left side of the housing.
3. If the recoil and striker spring assemblies have been taken apart, here is a view of the proper arrangement for reassembly.
BRNO Model ZKM 452
Similar/Identical Pattern Guns
The same basic assembly/disassembly steps for the BRNO Model ZKM 452 also apply to the following gun:
BRNO Model ZKM 452D
| Data: | BRNO Model ZKM 452 | |
| Origin: | Czechoslovakia | |
| Manufacturer: | Zavody Presneho Strajirenstvi, | |
| Uhersky Brod | ||
| Cartridge: | 22 Long Rifle | |
| Magazine capacity: | 5 rounds | |
| Overall length: | 43½ inches | |
| Barrel length: | 23.6 inches | |
|
Weight:
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