Introduced 2017 in 12-gauge only. Supersedes Super X3 (SX3) series. Among its features are larger controls that are easier to operate, synthetic stock with improved ergonomics, including a smaller pistol-grip and textured gripping surfaces. Operates with self-adjusting system that cycles a variety of loads while reducing felt recoil. Back-bored, drop-out trigger group, length-of-pull spacers. Offered in several variants including Field and Field Compact, both with walnut stocks, synthetic stock model and Waterfowl Hunter (shown). In 2019, SX4 Waterfowl Hunter Realtree Timber, SX4 Hybrid Hunter Realtree Timber, SX4 Hybrid were released as SHOT Show specials and with 20-gauge models. Also, in 2019, the SX4 Compact 511230392 in 12/3"/28" was released, along with 20-gauge 3" chamber models with 24" barrels (511230690), 26" barrels (511230691), and 28" barrels (511230692).

Shorter 13" length of pull, black composite stock, matte black receiver, Truglo front sight, large safety button, larger bolt handle and bolt release button.

Satin varnish finish grade II/III walnut stock, matte nickel finish alloy receiver, Truglo front sight.