Good morning. I have a recently purchased 2016ish Sig P226 Elite. It came with two slides, one slide and barrel in 9mm and the other in .40. I’ve purchased a new .357 Sig barrel for the .40 slide. Question, the .357 and .40 barrels are interchangeable correct?
Yep, should drop right in.
I assume you’ve already tried the 357 barrel in the 357/40 slide, so this is probably not necessary, but one thing to be aware of with new, never-installed SIG Classic line pistol barrels is that sometimes they can be a little tight in the slide due to manufacturing tolerances. The first 357 P229 I purchased started life as a 40 S&W model, but because I wanted the 357, the dealer just swapped in a new barrel. That barrel was a tight fit and sometimes wouldn’t go into battery when cycling the slide slowly by hand without an extra nudge. After firing a box or two (I’m no longer sure) of ammo, that hesitation went away.
Otherwise, 357 and 40 are interchangeable, including using the same recoil springs (despite some aftermarket claims to the contrary).
“Most men … can seldom accept the simplest and most obvious truth if it … would oblige them to admit the falsity of conclusions … which they have woven, thread by thread, into the fabrics of their lives.”
— Leo Tolstoy
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