Probably someone in Belgium. At least the barrel was made there. The firm of Simonis, Janssen & Dumoulin used "New York" on a lot of their shotguns, but "Warranted" usually indicates a lock distributed through hardware stores. If these parts were stocked by a known gunsmith, his name or initials will be on top of the barrel near the hammer.
National Muzzle Loading Rifle Association was created in 1933.
muzzle velocity
A silencer should go on the muzzle
Depends on the skill of the user.
To ease loading.
in the U.S 1 minute old!
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.
The standard infantry weapon was a muzzle loading Springfield percussion cap rifle. The cavalry fired a breach loading Sharps carbine. Most artillery field pieces were also rifled and muzzle loading.
Money, experience, intended use.
Jazz. And an old style of muzzle loading rifle- the jezail.
You will need a professional appraisal