I'm considering Leggo like options:

If I have a P226 357 Sig, can I swap that longer barrel into a P229 .40?

no.

The locking lugs on P226 and P229 barrels are different.

Buy both pistols. They are great

Thanks for the information!

But P226 .40/357 magazines can be used in P229's?

quote:

Originally posted by RichardC:
But P226 .40/357 magazines can be used in P229's?

Yes. The fit isn’t great and factory mags don’t offer a capacity advantage in using the 226 mags.

But they will work.

Consider a Glock 22, a Desert Eagle, or a P220 if you are want a LEGO set with bullets.

The G22 can be swapped into at least five calibers and carbines.
The DE is compatible with six of them and have four barrel lengths to choose from.
P220s are available in more than six varieties, chasing down some is quite the task, but worthwhile.

Good luck!