Bayonet
muzzle velocity
I think you are thinking about bayonets, where a dagger or a sword like device is made to fit under the muzzle of a rifle. Flintlock rifles/pistols are also possibilities.
National Muzzle Loading Rifle Association was created in 1933.
Butt to muzzle
A silencer should go on the muzzle
You can, but, why would you?
300m/s
It is used to reduce the recoil of the rifle and as a grip for cocking the barrel.
Varies with barrel and cartridge, but the muzzle velocity is about 2600 feet per second.
200+ ft. lbs at the muzzle
Depends on the skill of the user.
The muzzle 9front end) is rounded over- that is the crown of the muzzle. Some target rifles have flat muzzles.