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SD one is pretty much drop in, though the engraving looks a bit goofy...it also includes machined sights, separate piece for extractor, and the decorative rear selector pin piece.
You need stronger recoil spring and hammer spring, one to help the slide return and one to deal with propane. Stock frame really does not like propane and mine cracked with about 2 long mags worth of shots BEFORE I upgrade to metal slide.
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