5.56 NATO cal., GIO, mid-length gas system, 14.5 or 16 in. CHF chrome-lined barrel, super compact gas block, nanocoated Surefire closed-tined Warcomp or 1650 flash hider (permanently attached on 14.5 in. barrel), SSA-E X w/lightning bow trigger, B5 Systems enhanced Sopmod stock w/Mil-Spec 6-pos. buffer tube, 13 1/2 or 15 in. SMR MK16 rail w/center tab, Geissele Rifle Grip (GRG), Super Duty M4 upper/Mil-Spec lower receiver, Airborne charging handle, Luna Black (standard), DDC (Desert Dirt Color), Iridium (disc.), 40mm Green (disc.), gray (mfg. 2021 only), or OD Green finish.
5.56 NATO cal., GIO, carbine gas system, 10.3 (new 2020) or 11.5 in. CHF chrome-lined barrel, super compact gas block, nanocoated Surefire closed-tined WarComp or 1650 flash hider, SSA-X w/lightning bow trigger, 9.3 or 10.5 in. SMR MK16 M-LOK rail w/center tab, Super Duty M4 upper/Mil-Spec lower receiver, SB Tactical SBA3 brace w/Mil-Spec 6-pos. buffer tube, Geissele Rifle Grip (GRG), Super 42 braided buffer spring w/H3 buffer, Airborne charging handle, Luna Black (standard), DDC, Iridium (disc. 2020, reintroduced 2022 for 10.3 in. only), 40mm Green (disc. 2021), gray (new 2021) or OD Green finish.