Pyrenean, this is an STI doublestack, which doesn't have grips like a normal 1911...
More to the point, the trigger raceway in these guns is SPLIT between the metal frame, and the plastic grip frame. The trigger has to be captured between these two parts, for assembly.
[this is because of the need to solve a 'spatial' problem, found in all doublestack 1911s: the trigger bow has to be wider, too wide to pass through the gap left when the grip safety is removed. Each maker of uber-wide 1911s has a different solution to this: Para cuts the frame and uses the grips to hide the gap; Caspian and BUL use a special grip safety, with two 'ears', to fill the gap in the frame; Wilson's 'SpecOps' is... actually I don't know how this one works, but it appears be to based around a trigger with a removable (pinned) finger pad.]
Anyway... when the OP changed grip frames, he effectively changed the bottom half of his trigger raceway in the frame, including the slot from which the trigger emerges, in the triggerguard. Oh the triggerguard's new now, too. If this were my pistol, I'd strip it back down and look for any burrs in the plastic grip frame (I'm guessing, probably near the front), the triggerguard and anything else that the trigger bow and finger pad get to touch.
To the OP: did you also change the trigger itself? I thought that STI sells the grip frame, the magazine release and the trigger together, as a set.
Too many people miss the silver lining because they're expecting gold.
M. Setter
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