Greetings all, I'm a new comer to this site so may not know the rules well but will try not to make any one unhappy. I bought a new RDB almost two years ago. Love that little gun!! Slick design work, darn good ergonomics and downright sexy good looks. The problem showed up when I tried to shoot it. Only one single time has my RDB fired ten rounds without multiple fires, sometimes three or four at a time. I acquired an RMA from Keltec and sent it back. This was during the recall I think it was the Sub gun problem. Keltec kept my rifle four months then it showed up one day with a note saying that they found no problem with it. I'm at a lose as to what to do. I have machine capability and have built/restored several dozens of guns from ww2 BM59 to Galils,AKs, Mausers and so on. I did install a firing pin spring but that made no difference. I've even had this rifle fire on dropping the bolt! What I can say at this point is that I do not believe this is a firing pin problem. I'm becoming convinced that ,at least in my case, this is a sear problem. I think the secondary is failing somehow. What I need at this point is a good understanding of how the fire control system is supposed to function, maybe a good exploded view with a flow chart, a good bit larger than that in the manual. Any help or advice will be most welcome.