I was cleaning out my attic and I found a box of misc gun parts, grips, scope rings and so forth. The surprise was a 25 rd banana magazine for a Ruger 10/22 I thought I had lost in the 1980s. I've had my 10/22 since 1972 and the mag was a gift from before I met my wife so it's pre 1981. It must have got tossed in the box during one of many moves over the years. I 've heard it's legal for me to possess AND use as a grandfathered item. It's clear plastic and over thirty years old. I'm not ever sure it's safe to use anymore, the attic gets pretty hot in summer. Is it Cal legal? Is it safe? I'll break it up if not both.