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San Tan Tactical STT-15 AR15 Matched Billet Sets Ambidextrous and STT-15Lite AR15 Receiver sets, STT Big Bore Set. Build your own dream rifle! Choose from the multiple caliber's that our Receiver sets will accommodate, from .223, 556, 6.5 Grendel, 6.8 SPC, .458 SOCOM 50 Beowolf or the New Hornady 6mmARC!