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Discussion Starter #1 (Edited)
Can anyone tell me which standard 1911 parts are not compatible with the STI and SVI systems. I already figure that the magazines and trigger are not, but I was curious about grip safeties, thumb safeties, back straps, mag release buttons, etc.

Thanks,

Original Tex
 

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Hi Tex

Nonstandard parts of the modular frame:

Magazine
Magazine catch
Trigger
Plunger tube (integral to frame)
Mainspring housing
Mainspringhousing pin (longer)
Grip screws and bushings
 
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