remove mag, pull both slide release down, slide the slide foward, unscrew the blowback assembly (only one screw), screw it back in the metal slide (watch out for the 2 small springs) put your innerbarrel in the new metal outerbarrel, reassemble.
thats it. if you have any Qs, I'm still here for a few mins
EDIT: replace sights (slide the rear sight side to side)
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