Dusty Devil Dale Posted June 15, 2021 Share Posted June 15, 2021 My Uberti 1873 was giving me problems. I would often jack out rounds when firing fast, and the rounds would be lightly struck by the firing pin. I thought I was outrunning the hammer fall, because I also was experiencing minir OBDs very frequently. I replaced the main hammer spring with stock Wolff springs, and tightened the tension until it began to adversely stiffen the lever action. It made a little improvement (less frequent misfires), but did not fully correct either the OBD or misfire problems. Next, I checked the lever. It appeared to be bent in slightly, judging from bolt closure and lever safety timing, (and also from the fact I discovered it was 0.16" short of even being SASS legal !). I reformed (opened) the lever, and it corrected the OBD issues, but it still did not correct the cartridge misfires. Next I looked at the firing pin operation. I used a matching size twist drill to clean out the crud accumulated in the firing pin recess in the bolt. It made an improvement, but still did not fully correct the misfire problem. Misfires (Federal primers) would occur even when the action was operated very slowly. So next, I looked at the firing pin extension. It showed typical wear along sliding surfaces, but nothing unusual. Then I noticed the little sliding key recess in the extension where the fp extension is engaged by tab at the front toggle. The slot was VERY roughly machined, showing concentric machining marks. The articulating surface of the key itself was also very roughly finished. I wondered if that tiny drag on the extension could be enough to reduce the firing pin extension's forward speed upon firing. I polished the slot to a mirror surface, using 1500 grit wet-or-dry, wrapped over a needle file. I also polished the little tab by rubbing it across the same abrasive, flat on a saw table. Now, after about 500 rounds, the problem appears to be resolved and the rifle is operating properly. I am just passing this saga along, however useful. Link to comment Share on other sites More sharing options...
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