Being an avid Maynard shooter - I just couldn't pass up on this 2nd Model Percussion Heavy Barrel Maynard that was offered on Rock Island Auction a year or two ago. It's obvious it is not an original gun, but a put together Maynard - but What A Maynard !!!! It's chambered in .40-40, with six grooves and six lands, .404 bore and .418 grooves - certainly not a percussion barrel. I believe it was just a work in progress and was meant for a center fire breech piece eventually. My main reason for that thought is, unless you have a neck like a giraffe, you can't use the percussion stock in combination with the close eye relief on the scope. That's not to say it couldn't have been made for strictly shooting off a machine rest. Regardless - it's a work of art by someone who obviously desired an ultra heavy Maynard. The barrel is 28 inches long and tapers from 1-1/2 inch at the breech to 1-7/16 inch at the muzzle.