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The Remington 550-1 was manufactured from 1946 to 1970. Approximately 730,000 of them were made in that time. The 550-1 is a semi-automatic.22 rimfire rifle that is actually a redesigned Model 550A. The Model 550A made use of a floating chamber design that allows the use of.22 Short, Long and LR ammo in this semi-auto rifle.