Daemon Defense gives you lots of choices, starting with the barrel. The standard barrel for the OPR-15 in .300 blackout is a fluted, medium-profile, 16-incher made from 41V50 steel (a chrome-moly alloy with vanadium added) rifled at a 1:7” twist rate and chrome lined. It features hand-polished M4 feed ramps, a manganese phosphate finish and a muzzle threaded at 5/8” x 24 TPI for attachment of a .30 caliber suppressor. The muzzle is fitted with a CMMG SV muzzle brake—a robust, no-nonsense brake that provides substantial reduction in perceived recoil and muzzle rise. The 5.56 NATO barrel is identical except for the smaller bore diameter and its 1/2” x 28 TPI muzzle threading for attachment of a .22 caliber suppressor. A 14.5-inch, M4-profile barrel with a pinned and welded SV muzzle brake is a no-cost option in 5.56 NATO.
The standard handguard on all OPR-15 carbines is a 12-inch KeyMod with full-length Picatinny top rail. Our evaluation model was fitted with the optional 13-5-inch M-Lok handguard ($49 upcharge), with full-length Picatinny top rail and seven M-Lok flats around the circumference offering a total of 43 M-Lok attachment slots. It also has 34 ventilation holes on each side immediately below the top rail. The upper receiver top rail and handguard top rail fit like they grew together, as do the two receiver halves.
