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Jacques, it converts a Sig P229 357Sig to be able to fire 40S&W caliber with just a barrel swap.

It will convert sig P 229 handgun from .357sig to .40S&W with just a barrel change can also be used to convert a 9mm sig P229 to 40 S&W but you would need a recoil spring and a magazine

Jacqes, Converts 357 Sig to 40 S&W in the P229. Can not convert 9mm to 40 S&W the 40 S&W conversion barrel will not fit through front of 9mm frame. Other conversion barrel could go 40S&W to 9mm, but not 9mm to 40S&W