Both the 1855 Rifle and the Harpers Ferry Conversion Mississippi Rifle are 2 banders.....They are RIFLES, not Rifled Muskets.
Here's some info:
Musket = smoothbore
Rifled Musket = 3 bands Full lenght barrel
Rifle = 2 band Rifled Musket.
Carbine = 25 inch or less barrels.
This is how the Armories of the time classified there production. If you look through the logs of Civil War armory production you will find these terms, It can get very confusing, asspesialy with the Confederate armories that use the term "RAISED" which means cut-down battlefield pick up. For example: if the had found an 1861 Musket that the barrel was destoyed beyond repair, they would "Raise" the barrel into a carbine. So you would still have a funtioning gun but with a really shot barrel.
I myself have such a gun, a CS Richmond Musketoon made from an 1861 Springfield, it's basically a "sawed-off" 1861 musket. This was a very common thing to find in the south. They even had a "Sawed-off" 1842 .69 caliber Smoothbore!!! OUCH!!!!! That Hadda hurt!! But the North did have this as well, it was the 1847 Carbine, which was a 20 inch barreled 69 caliber smoothbore....made that way for "Sappers & Miners" and Calverey.
Now the Harpers Ferry Conversion Mississippi, This is an amazing rifle. What Harpers ferry did was take exsisting .54 caliber 1841 rifles and convert them to .58 caliber rifles, put on a bayonet lug, and an 1855 long range rear sight(borrowed from the 1855 Springfield Rifle)
Then you have the Whitney Rifle, Whitney bought junk parts from the Natl Armories and made a Rifle that was a cross between the 1841 and the 1855, it too uses the long range rear sight and the 1855 lock, but an 1841 stock and bands.
Now you say "Well RJ, thats all fine and dandy, but I cant afford an original and nobody makes these fine rifles in repoduction!!"
Well thats where your wrong!!! There are 3 people that do!!!
Dan Whitacre of Whitacre Barrels......Great Guy!!! AMAZING CUSTOM BARRELS
http://www.whitacresmachineshop.com/
Mark Hartman of James River Armory.....Good guy, great guns. Bobby Hoyt Barrels.
http://jamesriverarmory.com/?page_id=20
John Zimmerman, No comment, I never delt with him, but his guns look nice.
http://www.edsmart.com/jz/