A bolt action firearm on which it is necessary to rotate the bolt handle upwards for unlocking before it can be pulled to the rear. Similarly, it is necessary to rotate the bolt handle downward after closing to lock the firearm and enable the gun to be fired.
Letter: T
TWIN-SINGLE TRIGGER
A double trigger arrangement used on some double-barrel firearms, wherein one or both triggers will, with each pull, fire the barrels sequentially. They are non-selective.
TWIST
The distance required for one complete turn of rifling usually expressed as a ratio, e.g., 1 in 10 inches.
TWO PIECE STOCK
A stock consisting of two separate parts, the buttstock and forearm.
TRIP
A part of the mechanism of some firearms which is released by the action of the trigger.
TWO-PIECE MOUNT
A telescope mount having two separate base band ring assemblies.
TRIPLE BASE POWDER
A propellant composed of colloided nitrocellulose, nitroglycerine and nitroguanidine. Generally used in large caliber military ammunition.
TRAP SHOOTING
A shotgun target sport in which clay targets are thrown away from the shooters by a reciprocating trap located forward of the firing line.
TRAP-DOOR BUTTPLATE
A type of buttplate with a hinged closure plate in the butt-end of a firearm. Opening of the trap door exposes a recess in the stock which can be used for storage.
TRIGGER
That part of a firearm mechanism which is moved manually to cause the firearm to
discharge.