Introduced 2018. Mod 2 features a proprietary mid-length gas system, gas block secured with locking ring, E3 round-lug bolt design, URX4 handguard, ambidextrous bolt release, selector and magazine release, drop-in 2-stage trigger, receiver end plate with ambidextrous QD sling swivel sockets, 6-position collapsible stock, fully ambidextrous lower receiver controls, extended charging handle latch, folding front and 200–600 meter rear micro-iron sights are standard features of the SR-15 E3 Mod 2. Specific units in Mod 2 line include M-LOK handguards and 1:7 rifling twist, such as the E3 31900 (16" chrome-lined barrel), E3 Carbine 31946 (14.5" barrel), CQB 31952 (11.5" barrel), and Light Precision Rifle 31973 (18" barrel). Price shown for E3 31900. KeyMod handguard versions also available.