This SIG Sauer factory style replacement barrel is ideal for shooters wanting to gain more versatility from their sidearm. – Capable of being inserting in standard SIG Sauer P229 handguns this drop in barrel is chambered in .357 SIG and provides excellent accuracy. – Switching calibers is as easy as dropping in this barrel and changing magazines. – Features hammer forged rifling and a heat treated design. – Blued steel .357 SIG.