The Noveske N4 Infidel 13.7″ Upper is chambered in 5.56mm and is available with either a 416R stainless-steel or a cold-hammer-forged barrel, both with a 1:7 twist. The 416R configuration includes a hand-polished Noveske Match Chamber, extended feed ramps, and a mid-length gas system with a pinned low-profile gas block. It uses a 4th-generation billet 7075-T6 aluminum receiver paired with a 15″ NSR free-floating M-LOK handguard, a continuous top rail, and a Noveske Love Handle ambidextrous charging handle. The 13.7″ barrel is fitted with a Noveske KX3 flash suppressor that is permanently pinned and welded.