One of the things Remington was famous for was making barrels back in the early 1800s. The brand has existed since 1816, so it may be an old. old part. Or, it could be something else. 
Back in the time when guns were hand made, the smith might acquire a lock from one source, the barrel from somewhere else and other parts as he saw fit, until he had enough to make the product. Assembled guns. Later, early automobiles were sometimes produced the same way.

The the easiest way to convert from flint to percussion is  the drum and nipple method, but it was also  the easiest (and cheapest) way to build a new percussion rifle. Thousands of percussion rifles were built using this method. Henry Leman was one of the most prolific makers of percussion rifles in the 19th century and the great majority of his rifles were of the drum and nipple method. Look closely between the rear sight and breech to see if there are any markings , this is where the makers signed their guns....Ed

Schutzenbob&calledflier,I believe you are right about Remington and their barrel making from all I have read.I have a Remington cast steel barrel(as stamped) on flat of barrel.It measures 34 7/16" in length,octagon with flat-flat measurement of1.483".Bore is perfect and never rifled,with what is a cleaning rod groove running from muzzle to breech--this looking as if cast when barrel was made as intergral to barrel.The bore measures =.365".The name stamped on left flat adjacent to top flat is A.P.Wood.I have no references for him.I also have a forged breech plug which is original to barrel as purchased 40yrs ago.I've seen several of these barrels in past.

Fritz wrote on May 15^th, 2018 at 6:17pm:


Wood, Amos P. North Hamden, New York 1850-1882

That sound like a pretty heavy barrel, probably made for a target rifle, shooting a bullet. These rifles usually had back action locks and no fore arm. Bullet barrels became popular in the east after Alvan Clark of Cambridge Massachusettswas granted a patent for the false muzzle in 1840....Ed