The SX2 and SX3 are the same gun mechanical wise. The main difference is their weights and looks. The SX3 reduces its weight by using parts from the Browning Fusion (Gold). It uses the same aluminum recoil and magazine tubes. The same goes for it’s lighter mid height rib and lighter barrel. Because of the barrel, the SX3 also has a thinner forearm than the SX2. The SX3 has more stock adjustments than the SX2. They have different lines on their receivers and stocks but don’t have any weight reductions there.