aap2
Plastic
- Joined
- Nov 13, 2009
- Location
- pittsburgh, PA
I have a Walther TPH pistol in .22lr that fails to fire about 10% the time; it's a little worse from DA, but it also misfires from SA. The firing pin indentations on the rim are all quite faint on all cases, fired or not. I added a Wolfe extra power mainspring, which did exactly nothing and the firing pin is moving free and has proper travel in the firing pin tunnel. The slide is fully forward and nothing seems wo be interfering with the fall of the hammer. I'm not too familiar with .22lr semi-auto pistols, but this sounds like excessive headspace. With a non locked breech semi-auto, is it worth getting a .22 headspace gauge to test for excessive headspace? I read that the German TPH pistols were tightly headspaced and would occasionally slam-fire; the USA/Interarms guns (mine) were made with greater headspace resulting in no slam-fires but poor reliability. I don't expect this tiny pocket pistol to be 100% reliable, but I would like it to work most of the time. Any suggestions would be welcome. Thanks.