Aftermarket Barrel For Rye Field 1991 Abrams?

I’ve seen one labelled for one of the M1A2 kits. I thought the gun was supposed to be the same, or at least the gun barrel, but I don’t care to take chances. I have the tank kit itself.

Yes, the M1A1 and M1A2 both use the same M256 120mm main gun. They are the same.