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OP,
First & foremost you need to ascertain IF your frame is of P229 or P228 Magwell configuration.
A P226 or P228 magazine body is of single taper above the mag latch slots to the feed lips.
P226 magazines will interchange in either frame/mag well.
P229-1 9x19(E2) 357/40 magazine body is of dual taper above the mag latch slots to the feed lips.
P229-1 or 357/40 mag bodies will not fit/function in a P228.