CYLINDER GAP

In a revolver, the space between the cylinder and the barrel measured with the cylinder in the rearmost position.

CYLINDER INDEXING

In revolver-type firearms, the rotational movement of the cylinder to bring the next chamber into alignment with the bore.

CYLINDER PIN

The pin around which the cylinder of a revolver rotates. This is a feature found on revolvers in which there is no crane. Also called Axis Pin, Base Pin, Center Pin.

CYLINDER RELEASE LATCH

A device which permits the swinging out of the cylinder from the frame of a revolver.

CYLINDER STOP

A device to stop cylinder rotation in proper alignment with the barrel in a revolver. Sometimes called a Cylinder Latch or Cylinder Bolt.

CUP WAD

A powder and shot separator of a shallow cup design which when loaded with lips down acts to help seal powder gases and so protect the rear of the shot column.

CYLINDER STOP NOTCH

One of the machined grooves on the circumference of a revolver cylinder that is engaged by the cylinder stop in order to assure barrel and chamber alignment. Also called Bolt Notch.

CUT CHECKERING

Checkering which is cut with a tool into the surface, either by hand or machine, rather than impressed.

CUT CHOKE

A choke formed by a reamer during manufacture of the barrel of a shotgun.

CUT OFF RUPTURE

A generally circumferential separation in the side wall of a cartridge case. May be complete or partial.