669 missing right side safety lever. When I shoot the gun, round loads into chamber, but will not fire unless I lower left side safety into lock and then back to off. I have to repeat this for every round. I bought this gun 30 years ago and just went to range for first time since I bought it (has benn in closet 30 years and gun is in mint condition) and that is when I realized gun had this issue. Does the removed lever need to be replaced in order to shoot properly? I am unable to find part online. Thanks.