(posted on Sep 05, 2012)
I bought a new 625JM and installed the Miculek spring kit, adjusting the mainspring per instructions. In spite of using the recommended Federal primers in my handloads I experienced the occasional failure to fire. Having had very good results with other Apex products I ordered the XP Ignition Kit and have had no further FTF problems thanks to that little bit of extra pin length. As an additional bonus I find am now able to use both factory ammo and Winchester primers in handloads with no problems. I plan on installing the XP Ignition Kit in my 686.
(posted on Nov 26, 2011)
I'm currently running one of these in my CC/BUG 9mm conversion M&P 340. This setup has sent 450 flawless rounds down-range so far without complaint from the gun (but plenty from my hand). Despite being 0.500" longer, never once has it pierced a primer. The rounded profile (versus factory conical) is perfect for reliable ignition.
Everyone I know with an S&W wheel gun now runs one of these, whether it's for play, concealed carry, or duty/back-up purposes.