Breech plug

(Gun.) in breech-loading guns, the metal plug or cylinder which closes the aperture in the breech, through which the gun is loaded.

See also: Plug

References in periodicals archive ?
The end of the breech plug is shaped as a cone with a flash hole down its center.
It has a one-piece stainless steel Accelerator Breech Plug, which allows the shooter to use either loose or pelletized powder without changing anything on the gun.
Traditions offers a depriming tool, but I find using thumb and finger to pluck them from the receptacle of the Accelerator breech plug to be easy enough, plus I don't have to keep up with another item in the field.
First, by use of the two-stage Mag-Prime Breech Plug System, the X Series can be de-primed without discharging the gun.
First you want to make sure that the touch hole is located ahead of the end of the breech plug.
When the breech plug was lowered, a circular opening became exposed in the top of the barrel, revealing a chamber just large enough to take a charge of powder and a spherical bullet.
It also means it's impossible to clean the breech plug surface without using a "fouling scraper" accessory.
The Impact's breech plug has a triple-lead thread that allows the plug to screw into the breech with only about five turns vs.
This model was named for the introduction of the Accelerator Breech Plug, which releases with three revolutions and no tools for quick cleanup.
Also included is our custom made collapsible brass and wood ramrod that tucks neatly into the forend when not in use and a wrench for easy removal of the breech plug for both safety and easy cleaning.
You explained the origin of the practice of measuring muzzleloaders from the breech plug to the muzzle and how this has logically carried over to modem firearms--but you didn't mention revolvers, as did Mr.
50 caliber muzzleloaders come standard with breech plug wrench, sling swivels and frame-mounted telescoping ramrod.