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: | 6.9 pounds |
The ZKM-452 was introduced in 1992, and this high-quality rifle was imported from Czechoslovakia by Action Arms. There was also a Deluxe version, which differs only in stock quality and added checkering. A synthetic stock is also offered as a lower-priced option. The present importer of the rifle is CZ-USA.
Disassembly:
1. Remove the magazine. Hold the trigger to the rear, open the bolt, and remove the bolt toward the rear.
2. Remove the front stock mounting bolt.
3. Remove the rear stock mounting bolt, located between the trigger guard and magazine well.
4. Remove the action from the stock.
5. The stock buttplate and the trigger guard unit are retained on the stock by two wood screws.
6. Push out the trigger pin toward either side. Restrain the trigger, as the spring is under tension.
7. Ease the trigger downward. It is not taken off at this time, as it is still retained by its sear-contact cross pin. That cross pin, and the one that pivots and retains the spring guide, are riveted in place, and routine removal is not advisable. The trigger spring and the adjustment lock-washer can be removed from the guide at this point. Take care that the small washer isn’t lost.
8. Restrain the sear, and push out the sear cross pin. Caution: The sear spring is powerful, and there is a small ball bearing between the spring and the receiver. Control it and ease it out. Considering the reassembly difficulty, this system is probably best left in place unless removal is necessary for repair or refinishing.
9. Remove the sear and trigger assembly downward. After removal, the parts are easily separated.
10. The magazine catch and its spring are pivoted and retained by a cross pin. Caution: Control the catch and its spring as the pin is drifted out. The magazine housing is retained on the receiver by two screws, at front and rear.
