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I own 2 SIG SAUER P229 40s. I wanted a .357SIG. Brought this barrel, swapped it out of one of the 40s and voila! Easy-peasy replacement! The .357 uses the same magazines as the 40. Just be careful NOT to mix up which mags are 40s and which are 357s. I used a highlighter marker to clearly note which is which. Great purchase. I highly recommend this product even if you own only one P229 40. Just swap out the barrel whenever you want to shoot a different caliber.
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