I've been told that it is difficult to get an exact trigger pull weight on a polymer gun due to the variances in the frames. They are not all exactly the same, close but not exact. Due to these variances in the frames one would be remiss to quote an exact trigger pull weight. With that being said one could use springer precision, tactical technologies or canyon creek to name a few. I have purchased trigger kits from tactical technologies Tactical Technologies and a tungsten guiderod from canyoncreek www.canyoncreekcustom.com http://www.canyoncreekcustom.com creek both great companies.
I bought and installed the Springer kit in my xd9sc and it's excellent. Shortens the overall travel a bit, lightens the pull to about 4#s, smooth pull and clean break. Much better than stock, and even better than the stock XDM.
From what I understand, Springer also is THE place for XD triggers, if you want to have them do the work. I believe he uses the same parts as the kit they sell, but hand fitted and tuned. Just my 2 Cents. 8)
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