Also bear in mind that there are two versions of the 3913TSW.

There's the 'original' model made without the accessory rail, loaded chamber inspection port, uses a 7-round magazine and has the front of the grip frame cutaway to accommodate the reduced length magazine ... and then there's the current model which has the standard profile grip frame, uses the standard 8-rd magazine, has the loaded chamber inspection port and has the riveted accessory rail.

FWIW, I haven't heard if the newest ones have also received the integral machined rail as has been offered as an option on the 4566/4006TSW's. I know an agency who just received an order of some new production 3913TSW's as issue weapons, so I'll have to remember to ask about them next time I have the chance.

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Ret LE Firearms inst & armorer