George Moller, American Military Shoulder Arms, Volume III, states that during 1861, in addition to the 1,000 rifles and saber bayonets purchased from Massachusetts, Maine sent 598 unaltered Robbins & Lawrence Model 1841 Rifles to Ames Manufacturing Company for alteration to sword bayonet. Ames altered 595 of these rifles and returned three rifles unaltered. Ames' alteration of these 595 rifles consisted of attaching a bayonet lug with guide key (~25 mm) to the rifles’ barrels. It is believed that the bayonet studs used in this alteration differed slightly from the 1500 Ames had previously altered for Massachusetts by the way the lug was attached to the rifle's barrel by mortise and three pins. There is a large diameter pin near the rear of the stud's foot and a smaller pin near the front. A third pin passes through the round ended guide key. There were no other alterations to the rifle's forestock or rear sight. The stud is 3.5 inches (89 millimeters) behind the muzzle.
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