I have a T/C White Mtn. Carbine that has a fast twist barrel barrel that I'd like to make a longer patched roundball rifle in .54cal. I see that Green Mountain sells the drop-in IBS barrels for T/C sidelocks, but the don't specifically mention if they will work with the White Mtn. Carbine stock.

I guess my question is if all T/C sidelocks use the same dimensions for the placement of the barrel pin? If so, any of the barrels should fit just fine.

Mike