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Unfortunately it's a proprietary barrel and there's not likely to be any aftermarket parts available.

I do know that the recoil system in the STI LS and BLS is pretty closely tuned to a given cartridge and it's fairly critical for good performance of the gun due to the lightness of the slide and shortness of stroke. The LS series slide cycles very fast. The .357 Sig may be too hot for the gun.
 
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