Zb-50 Machine

Weapon Only Gun

ZB Machine Gun, Model 50-1932, 7.92 mm. The Only Weapon Designed by ZB Based on the Short Reco:l Principle.

during the movement of recoil and at the instant of unlocking exerted its full force on the holt, speeding it rearward. These features were invented and patented by Anton Marck, one of the noted gun designers in the employ of the ZB plant. The accelerator was in appearance very similar to the well-known Browning type.

This model unlike its magazine-fed predecessors employed metal push-out type links to form a non-disintegrating belt for the purpose of placing cartridges in the fcedway. After the discharge

of the last round the belt fell out the left side and the bolt and its components were held by a stop in the cocked position. When a loaded belt was inserted, the stops were raised and the bolt moved forward a few thousandths of an inch to be caught bv the rear sear. This necessitated a

pull of the trigger to release.

The only thing needed for complete disassembly in the field was a loaded cartridge, with the bullet point being used to depress certain spring-loaded detents.

The trigger housing was so designed that it slid on the bottom of the breech casing when released from its spring-loaded detents to cock the mechanism manually. The housing had two

/ o small grips on each side that acted as the charging piece. The advantage of this arrangement was that the two grips could be used to cock the piece when it became necessary to load the weapon by hand.

A muzzle booster that trapped the powder gas after the bullet left the barrel was used to increase rate of fire by bringing this pressure to beat on the face of the barrel. This device work ing in conjunction with the mechanical accelerator gave a cyclic rate of 600 shots a minute. The muzzle booster was also designed so as to act as a flash hider and front barrel bearing.

The safety catch was of unusual design on this weapon, being so constructed that, when it was on, it held not only the sear locked but also threw

the point of the incoming round down at an angle so that if by any chance whatsoever the sear did become disengaged and the bolt go for-

o O o ward the cartridge was in such a position that it would not chamber.

Perfect coordination between the counterre-coiling barrel and the moving belt was assured by a specially constructed piece that permitted the return movement, of the bolt only after the barrel had gotten into battery.

To fire the ZB-50. the gunner, generally prone, raises a cover in front of the feedway and inserts a loaded cartridge belt from the right side until the first cartridge is under the spring-loaded holding pawl. Then the firing grips arc released from their detent and shoved forward until the sear engages the bolt. It is then pulled all the way to the rear. At tfiis point the rear sear engages its recess in back of the bolt, holding the firing mechanism in the retracted position. Rearward motion also compresses the driving spring

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