This blue steel hammer extension is a must for anyone using a scope on a Marlin lever action rifle. The knurled grip provides an excellent gripping surface, and the extension is reversible for left or right hand shooters. This extension slips over the hammer and requires no alteration or gunsmithing. NoteFits all Marlin ever actions made in 1983 or later, including 39A, 39M, 1984, 1984C, 1985S, 336C, 336T, 375, 444S, and Glenfield 30A