Operators Safety & Instruction Manual

FUNCTION OF THE RIFLE/CARBINE

Your Diemaco firearm has a semi-automatic action. The action is cocked, with the chamber loaded and

selector lever set to “R”. The trigger is squeezed, the trigger rotates, disengaging the trigger sear surface

from the hammer. The hammer spring drives the hammer forward to strike the firing pin. The firing pin

strikes the primer in the base of the cartridge igniting the primer composition which ignites the main powder

charge.

High pressure gases push the bullet down the barrel where rifling grooves impart stabilizing spin to the

bullet. As a bullet passes the gas port (a small hole in the barrel below the front sight) gas is tapped off and

flows down through the gas tube into the bolt carrier chamber, driving the bolt rearward. As the bolt carrier

moves to the rear, the firing pin is withdrawn into the bolt while the cam track in the bolt carrier acts upon

the bolt cam pin, causing the bolt to rotate until its locking lugs are no longer in engagement with the lugs

of the barrel extension. The bolt is now unlocked and is carried rearward by the bolt carrier.

The extractor extracts the spent case and holds it against the face of the bolt. Once the spent case is exposed

to the ejection port the ejector then ejects the spent casing.

The bolt carrier continue rearwards, compressing the return spring and returning the hammer to its cocked

position, until the buffer assembly strikes the bottom of the receiver extension and stops. The return spring

then forces the bolt and carrier forward so that the bolt feed lugs strips the next round of ammunition from

the magazine and directs it forward into the chamber. Simultaneously, the extractor snaps into the groove

of the cartridge case and the bolt locks into the barrel extension. The hammer is now held rearward by the

disconnect.

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15680S-EN