Was given yesterday a Sheridan blue streak 5m/m 20 cal. that has not been shot in many years- excellent condition- would like to know any precautions beside cleaning barrel first ? Was told less than 20 pellets thru it. Serial # 197530 any idea of age ? what pellets they like ? what do you owners think of these ? All comments welcome I knowI I'm leaving something out. Thanks in advance Darell