mibighntr,
If it truely is a "SIDEKICK", it will have the shortened receiver that will not accept any other barrels. It could be a SB1 Huntsman, they can accept the same barrels as the SB1 shotguns. They can not accept center fire rifle barrels for safety reasons, as they are not hardened like the SB2 rifle receivers.
The 26" barrels are considered the magnum barrels and can accept 150 grains of Pellets.
These rifles can be as accurate as any of the top-of-the-line rifles out there, even more so IME.
The Sidekick rifles ALL used the "BP" (Black Powder?) prefix, you can not tell the year they were manufactured without calling Customer Service. I just hope that information didn't get lost in the Remington shuffle?
If it is a 26" barreled Huntsman, it should have a "NV or NW" type prefix.
Does the "mi" in your handle stand for Michigan? If you decide to pass this rifle up, could you please give me a PM with it's price and location?