Think the AR platform is only good for target shooting, self-defense, predator and varmint hunting? Think again with the San Tan Tactical STT-15 Big Bore PILLAR Billet Upper Receiver. For starters, the STT-15 Big Bore PILLAR upper receiver is incredibly light coming in at 8.2oz! It features an enlarged ejection port to freely pass .458 SOCOM all the way up to .50 BEOWULF. We designed the STT-15 Big Bore PILLAR upper receiver to overcome the shortcomings we saw in the current offerings. It needed to be lighter, stronger, and different, and all while looking good doing it. We weren’t going to settle for just hacking another receiver out of a block and calling it good!

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