breechblock

The breechblock is shaped like a section of a circle.

Turning the crank further opened the breechblock and extracted the spent case.

The breechblock is the main part of the mechanism.

The operating handle is then used to swing the carrier and breechblock open.

The split rings contract to their original size, and the breechblock can then be opened.

A few guns use a similar design, but with the breechblock sliding horizontally.

It had a vertical sliding breechblock and a box type trail.

There were whispered comments and the sound of a cannon's breechblock, followed by another boom.

As you can see, after the breach and the breechblock have been threaded, channels are cut in each of them.

Figure 4-18 shows the operation of the sliding-wedge breechblock.

The breechblock must open and close quickly while making a high-pressure gas-tight seal.

The beveled edge of the breechblock forces the round into its seated position in the chamber.

It had an interrupted thread type, drop breechblock mechanism.

As the powder case cleared the top of the breechblock, the block would rise to seal the chamber.

The firing pin was housed within the breechblock.

It can readily be differentiated from the Model 38 75-mm gun by its interrupted thread breechblock.

The underside of the breechblock is slotted to travel over the ejector.

The breech operating mechanism is primarily designed to actuate the breechblock.

There were 5 variants, each differing in size and caliber, but all using a breechblock designed by Mason.

A second layer cylinder called the jacket extends rearward past the chamber to house the breechblock.

The A-12.7 machine gun is a gas-operated weapon with a vertically moving wedge breechblock.

When the shell was loaded, the rear of the cartridge case tripped a catch closing the breechblock.

(a) In view A, the breechblock is open, and the cannon is ready to receive the ammunition.