I bought a relatively early(about 12 years ago) OOW BAR and just sent them my gas plug to have them modify it and then I reinstalled it. It would only function on the biggest gas setting. I just assumed that was how it was designed to work until I started asking others on the web about theirs. When I found out about the small updated modification, I had it done. I took it out on Friday and it worked fine on the lowest gas setting. But when I got home I discovered that the firing pin broke. I called OOW and they are sending me out a replacement, no charge. OOW is a good company to do bussiness with. I was using 70's Korean 30-06 has anyone else had a similar problem?