The Noveske N4 Infidel 13.7-inch 5.56mm upper (brand part no. 03002553) is a complete flat-top upper receiver assembly built by Noveske around a 13.7-inch barrel with a 1:7 twist. The muzzle carries a Noveske KX3 flash suppressor that is permanently pinned and welded to the barrel. It uses a mid-length gas system with a pinned .750-inch low-profile gas block and a 4th Generation billet receiver, topped with a 15-inch NSR M-LOK handguard. It is the upper for a builder who wants a short, fast-handling carbine that is built to last.

Key Specifications

• The barrel length is 13.7 inches in 5.56mm with a 1:7 twist.
• The gas system is mid-length, with a pinned .750-inch low-profile gas block.
• The muzzle device is a Noveske KX3 flash suppressor permanently pinned and welded on 1/2-28 threads.
• The receiver is a 4th Generation billet 7075-T6 aluminum upper with extended feed ramps.
• The finish is Type III hard coat anodize plus Cerakote.
• The upper is a flat-top design with no carry handle.
• The handguard is a 15-inch NSR M-LOK free-floating handguard with a Picatinny top rail.
• The charging handle is the Noveske Love Handle ambidextrous design.
• The bolt carrier is phosphate coated and full-auto compatible, with a chrome-lined carrier bore and key.
• The barrel extension is an M4 profile with extended, hand-polished feed ramps.

Frequently Asked Questions

What is pinned and welded on this upper? The Noveske KX3 flash suppressor is permanently pinned and welded to the 1/2-28 muzzle threads, so it is permanently attached to the barrel.

What gas system does it use? A mid-length gas system with a pinned .750-inch low-profile gas block.

What is included in the upper? The barrel, billet receiver, 15-inch NSR handguard, forward assist, Love Handle charging handle and a phosphate bolt carrier group.

Buy the Noveske N4 Infidel 13.7-Inch 5.56mm Complete Upper, Pinned and Welded

A short, balanced upper changes how a carbine feels more than any optic. Order it from our Lubbock, Texas shop for direct shipping and see more AR-15 uppers.