![]() I have always leaned towards 1940, if for no other reason that 1940 was when the applicable Crosman patent ran out. D T Fletcher said: 'The 310-312-317-710 were all introduced at the same time, circa 1939-1940. " (12.7mm) or 5/8" (15.8mm) diameter as required. Benjamin 312 1940s (boxed) With thanks to American Vintage Airguns forum member Yngathrt. Mfg: Brownells SPECS: Chamfer Cutter X"X Hardened steel. All other Sets have a " diameter, 45 cutter. to correctly chamfer the larger barrel and cylinder mouths on those calibers. ![]() The 45 Cutter supplied in Sets marked with an * is 5/8" dia. Pilots for other calibers available separately. Purchase extra pilots to use one cutter for many different calibers. Interchangeable pilot keeps cutter properly aligned. Includes the cutter, a handle and one pilot, all in a polypropylene box. 22 Rf Muzzle (.211")Ĥ5 chamfering cutter breaks the edges of the rifling for a clean bullet exit or chamfers revolver cylinder chamber mouths for quick reloads. Brownells 45° Muzzle/Cylinder Chamfering Cutter & Brass Pilot - 45° Cutter & Brass Pilot Fits.
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