cartridge base

The breech block head; this part supported the cartridge base.

You can spot a Gordon system case by the plastic inner ring of the cartridge base, compared to the more usual solid brass head.

The SSG36 used a Becker principle of bolt head following the rebated rim cartridge base deep into the chamber.

This made the cartridge base much stronger, as early rimfire cartridges had a tendency to split at the base, causing extraction malfunction.

A large fragment of a M1028 cartridge base plate struck an active-duty Air Force Senior Airman.

The 13 mm centerfire Reffye mitrailleuse cartridges were loaded into interchangeable steel breech blocks (unlike the Montigny mitrailleuse whose ammunition was held by the cartridge base in plates).

Six Rimfire Rifles Exempted A centerfire cartridge is one whose detonator is set in the center of the cartridge base, rather than in the rim of the base.

A centerfire rifle is one that fires a cartridge whose detonator is seated in the center of the cartridge base, where it is struck by the firing pin after the trigger is pulled.