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I don't think it's offered separate from the rifle. Take a look at EGW rails (Prophet River has them), probably better quality then a factory rail anyway.
You can get the factory ones, but like all Beretta accessories, stupidly overpriced.
The EGW HD line, Near, and Murphy Precision rails would all be better options.
I believe ATRS might even make rails for the T3 now. Not positive on that one.
Thanks for the info guys. I do, in fact, already own a Near mfg base for my HS Precision rifle and it's the best. I was just inquiring for a "factory" base but agree that they would be overpriced. They do sell them separately.