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For differences between the normal 4.3 and the dual stainless, i think it has a different safety, both the slide and grip. internals should be exactly the same however.
In all honesty, you don't need to upgrade the capa at all, it'll perform very well for a long time on green gas. However, if you really do feel the need to upgrade to a metal slide, you're going to want a stronger recoil and hammer spring. I suggest the Guarder 150% springs.
along with the slide, you'll eventually want to replace the outer barrel too, because the metal slide will begin to chew up the plastic stock barrel.
My advice, keep it stock.
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