Every shop has customers who exclusively scour the shelves for the cheapest AR-15 parts in existence to cobble together an AR-15 build. This $492 San Tan Tactical SST-15 receiver set is probably not for those customers. On the other hand, this receiver set is for customers who demand the best, premier quality, flawlessly, feature-loaded AR-15 receiver set. San Tan Tactical’s receivers are well regarded as one of the premier AR-15 receivers made.