Yup, Quick said it. I had a 30-30 bought by me used, (so unknown history) and it would occasionally misfire. Then it got to where it would only ocassionally fire! I tried a new hammer spring, new hammer, new t-bar lifter, all to no avail. My old local gunsmith told me that 'if' someone had done a trigger job on the trigger, it could work in such a way that it wouldn't hold up the transfer bar properly. He said you couldn't see it happen when you worked the action slow, but it would fail at 'real time'. I finally bought a new trigger and the problem was solved. Could be, just could be.... 44 Man