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The caliber is the diameter of the barrel. The twist is the direction of the striations left by the barrel's rifling, clockwise (right-handed) or counterclockwise (left-handed). Most barrels will have a right-handed twist with the exception of weapons created by the Colt's Manufacturing Company which uses left-handed twists.
The open end of the syringe may be fitted with a hypodermic needle, a nozzle or tubing to direct the flow into and out of the barrel. Syringes are frequently used in clinical medicine to administer injections , infuse intravenous therapy into the bloodstream, apply compounds such as glue or lubricant , and draw/measure liquids.
A gun barrel is a crucial part of gun-type weapons such as small firearms, artillery pieces, and air guns. It is the straight shooting tube, usually made of rigid high-strength metal , through which a contained rapid expansion of high-pressure gas(es) is used to propel a projectile out of the front end ( muzzle ) at a high velocity.
Handbook of the 15-pr. B.L.C. guns, Marks I, II, II* and IV, with Mark I carriage and Marks I, IA, IB and IC limbers and wagons : land service, 1912 Author War Office, UK
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...
Combination guns generally have a selector that allows the user to choose which barrel will fire. Three-barrel versions known as Drillings, are commonly found with two shotgun barrels and one rifle barrel, and generally have two triggers, one for each shotgun barrel, and a selector that will allow one trigger to fire the rifle barrel.
Tigre Hill#The Barrel of a Gun; ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.