I just purchased the TS model today. On S&W website it states a Troy trx extreme rail but the one I have has a Troy Alpha rail with the 3 set screws to hold the rail in place. Did they change specs or just a fluke on mine. Got a good deal $1169. I put on an Eotech and an AFG 2. Good looking AR Gonna shoot it in a couple days. Any one else have this model any pros cons Thanks ShooterJD

I think the TRX uses a proprietary barrel nut, the Alpha uses standard barrel nut......check your nut, and you will know! Or post up a pic.....

My TS also has the Alpha rail.

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M&P 40c; 40 FS; 40 Sh; 15 TS