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My bad...I knew it was the series 70 or 80 hammers that did that. Mixed that one up.
Somebody may have monkeyed the mainspring. Normally, putting in a reduced (19#) spring will help lighten the trigger pull. Putting in even a standard mainspring will screw up Springfield's ILS system. The 28# mainspring in the ILS system (vs. 23 LBS standard) is shorter, and a real mainspring cap retaining pin is longer and straight (no bevel type profile to "lock" it). Mix the parts up and you'll get problems.
Check to make sure your ILS system is turned fully to the unlock position. I haven't experienced, or heard of, the system binding. Generally, it's locked or not locked, but anything is possible. The two little holes in the key way in the mainspring housing should be vertical. Horizontal, the system is locked. I'd say if they appear in the 11, or 10 o'clock position, perhaps it is binding the mainspring cap retaining pin and not giving the hammer strut full force.
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