Remington Model 550-1 .22 short. .22 long, .22 LR, semi-auto tube magazine fed Barrel code (zz)  indicates a manufacture date of 1953. The rifle has a 22" barrel and is in very good condition for a gun of this age. some light handling marks the bluing is in excellent condition the receiver was drilled and tapped for a side-mounted scope at some point in its life