I bought my kids Savage .22s for Christmas this year. # model 64s and a model 64fl. The 3 64s fire perfectly, however the 64fl misfires almost every other round. I load the clip and chamber the first round, pull the trigger and it fires, ejects, and chambers the next round. Pull the trigger for the second shot and only get a click. Manually eject the round and chamber the next and it will do the same process. Upon inspection of misfired rounds I noticed the firing pin mark was barely visible. Any suggestions on the cause.