.45 a.c.p. caliber (altered from .455) 4″ barrel, top break ejector system activated with the side lever. Checkered black composite grips. Finished blue with British broad-arrow stampings. Retaining much of the original blue with excellent grips. Mechanically excellent. Super bright bore and rifling. Comes with a set of half-moon clips for the .45 a.c.p.