![]() The Model 121 Remington which replaced the Model 12 can handle high speed ammo for example. Perhaps someone else that knows this gun will be along. On the left side of the barrel is 48, followed by a symbol that could be a D or an O (too. I was curious as to the actual date of manufacture, so I looked at the barrel. 22 model 581 rifle that I purchased new in May of 1972. I have no experience with the Model 6 so can't advise on it. I just found out about the month/year codes on Remington rifles on this site. Many of the guns of this period were not stout enough for high speed ammo. If you value your gun, I would recommend sticking to standard velocity ammo and use a more modern gun for high speed ammo. ![]() The person that gave it to me said they won the gun in a raffle in 1967 and thought it was a 1962 model. I was given a Remington Speedmaster 552 semi-automatic in the early 80s and was recently trying to find out its manufacture date. But there are known examples of bolt failure in these guns due to repeated firing of high speed ammo over a period of time. Identifying Manufacture Date on Remington Speedmaster 552. I shot high speed ammo for a little while in the first Model 12 I owned without permanent damage. The Remington Model 12 is a slide-action, solid-breech, hammerless, takedown, side-ejection rifle. The stamping will consist of a letter code followed by a four- or five-digit number. This can be found on the right side of the gun, just behind the ejection port. ![]() Can you shoot high speed ammo in the gun? You can, but repeated use of that ammo over a period of time can lead to damage of the bolt. The first step in finding your Remington Nylon 66 serial number is to locate the stamping on the receiver. There isn't adequate lockup surface between bolt and the receiver to safely withstand repeated firing of high velocity ammo over a period of time without risking damage to the gun. ![]()
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