I am fairly certain it is the rifled part of the barrel, not including the chamber, from the headspace ledge to the muzzle, and including any permanant non-rifled attachments to the muzzle. Therefore, a rifle with a fifteen inch barrel can be legal if it has a muzzle brake or compensator which brings its length to over sixteen inches.
It is used to reduce the recoil of the rifle and as a grip for cocking the barrel.
If you mean a muzzle brake or barrel weight, yes. It can change the vibration pattern in the barrel when the rifle is fired, changing the point of impact. Anything added to a barrel, such as a sound suppressor, will affect the zero.
muzzle velocity
A silencer should go on the muzzle
Varies with barrel and cartridge, but the muzzle velocity is about 2600 feet per second.
The muzzle 9front end) is rounded over- that is the crown of the muzzle. Some target rifles have flat muzzles.
The FEDERAL Firearms Act defines the legality of firearms in the U.S. For a rifle to be of legal size, the barrel cannotmeasure less than 16 inches in length (measured from the mouth of the receiver to the tip of the muzzle. and it cannot measure less than 26 inches in overall length measured from the tip of the muzzle to the tip of the stock.
To make the rifle easier to handle in tight spaces, or to remove a section of the barrel near the muzzle that has been damaged.
It is tapered. Diameter is different at different points. Usually this question arises when someone is shopping for a muzzle brake. Those made for the SKS and Mosin/Nagant have a straight sided barrel, and will not work on Remington.
What do you mean by short barrel? They were all 24" barrels. The barrel is measured by putting a stick ( or whatever ) down the barrel from the muzzle until it hits the bolt, it is not the measurement from the muzzle to where it hits the receiver. True for all guns. That is the barrel length. The 241 is a "Takedown" Rifle, so you have about 3/4 of an inch beyond where the barrel meets the receiver that is threaded so you can assemble and disassemble the rifle.
First thing that you will have to do is get the adapter for the end to accept the 14ccw then attach the muzzle brake