The trigger has probably been adjusted. If you do some searching on here for adjusting triggers it may help you. I am no expert, but had the same thing on one of my Strikers that I adjusted. I just can't remember which screw I turned to fix it.
A rifle basics standard trigger will work. Just cut off the lower part that you would normally use for a rifle.
If all else fails, check out specialty pistols forum. http://specialtypistols.infopop.cc/e...m/f/3826077864
There are several posts about Striker triggers with great pictures.
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