I just obtained a Browning 22 semi-auto rifle. The gun had sat unfired for 10 years or more but was in excellent visual condition. I believe it to be Japanese manufactured during the 1970s. Anyway, it has problems feeding ammunition from the magazine. Sometimes it feeds sometimes it doesn't. The cartridges appear to be up too high for the bolt to engage them. On the other hand at times the cartridges seem to be interfering with the bolt travel to the rear. There is nothing obviously wrong and I'm a bit baffled and any help would be appreciated.