3-4 years ago when I started experimenting w/ lighter hammer springs it was on my stock 92G. In one range trip I tried 16,14, 13, and 12. All was well except w/ the 12#. I thought I remembered a comment from somewhere about a skeleton hammer allowing lighter springs so I ordered one and installed it. Back to the range to try 13 and 12 and the 12# was then reliable. So, ever since then, I have been using a 12 in our range guns but stayed w/ 13 for defense guns. With Federal and CCI ammon I have never had a problem since then w/ a 12# spring. The physics of a given spring being able to get a lighter hammer moving faster, vs it having less mass when it hits the primer, is beyond me but it has been proven to be a fix. BTW, I have absolute faith in LTT parts. When I install them, the removed parts are saved in a ziplock bag marked (Removed from xyz) but I have never had a problem. Some of the parts will be installed in another 92. For instance a couple of Wilson trigger bars have moved to replace a stock bar when they were removed and replaced w/ LTT bars. Some black finished parts move to another 92 when I started buying NP3 parts.