If you are talking about the 50 caliber muzzle loader barrel for the Mossberg 12 gauge Shotgun model 500 or the Maverick 88 - you can't remove the breech plug. You have to clean the barrel like a flintlock.
I just bought one from Mossberg's web page (arrived yesterday 12/21/08). It didn't come with any instructions. Fortunately, I found the manuals online at the following addresses:
Muzzle Loader Barrel
http://www.mossbergs.com/manuals/Muzzleloader.pdf
12 Gauge Shotgun Model 500
http://pdf.textfiles.com/manuals/FIREARMS/mossberg_500.pdf
Good Luck
A 'muzzle loader' is any firearm (or cannon) which does not have a breech mechanism and which is 'charged' (loaded with powder and shot) from the muzzle end of the barrel.
from the breach face to the muzzle
ABOUT $100 FROM YOUR INFO
Look below for the link that says MUZZLELOADING RIFLE. Click on that, and it will take you to a photo of a modern day T-C Flintlock muzzle loader.
not sure if this is what you are looking for but a musket is usually smooth bored meaning it has no rifling in the barrel where a muzzle loader can have rifling. A muzzle loader refers to any weapon that is loaded thru the muzzle in a simple definition and it can be either smooth bored like a musket or rifled like a Pennsylvania long rifle or like most modern muzzle loaders are today
100-150 USD
I have a old double berrel muzzel-loader and I do not no how much it is worth.The name of the gun,I do not no.Can not read it.
yes
100 yrs or so, 40-100 USD
350 to 650 dependng on condition.
Check with Remington thru customer service at their website, and see who is a distributor in your area.
TOO COSTLY, RUINS THE VALUE, CHEAPER TO BUY A NEW ONE ABOUT $150