This Remington manufactured firing pin spring is for the model 522 Viper semi-auto rimfire rifle and is in near excellent condition with light wear. This spring measures approx. .292" in diameter and 3.503" long.  (file photo)

Note: Firearms with the following serial numbers have been observed with this part: 3017648, 3042385, 3062313, 3106813, 3112852, 3121044, 3162339, 3193221, 3201155, 3209072, 3227645, 3232240, 3232451 & 3247065.