This rifle is essentially the same pattern as the one used by Green River Rifle Works back in the 1970's. It may have actually been built from a GRRW kit but I have no way to ascertain that so I'm not claiming it as so. Either way, the workmanship is excellent. If you go to grrw.org you can see their rifle. The .54 cal barrel is 1 1/16" across the flats, has 7 grooves and uses a .526 ball, all of which are the same for a GRRW Leman. The lock is an L&R. It has a gold inlaid wedding band at the muzzle. The rifle is in excellent condition. It was my go to deer rifle until I quit hunting 5 years ago. $1,375.00 plus $70.00 shipping to the lower 48.