The Colt LE6933 EPR II complete upper kit (brand part no. LE6933-EPRII-CK) is a factory-assembled 5.56 NATO upper from Colt‘s Enhanced Patrol Rifle II line, built around an 11.5-inch barrel. The barrel is chrome lined and button rifled with a 1:7 twist, and it runs a direct gas impingement system under a 10.5-inch free-floating M-LOK handguard. A full-auto profile bolt carrier group and folding Magpul MBUS 3 sights are part of the kit, so it arrives ready to mate to a lower. For a builder who wants real Colt hardware on a compact upper, it is a ready-made foundation.

Key Specifications

• The chambering is 5.56 NATO, the standard cartridge for the AR-15 pattern.
• Barrel length is 11.5 inches, a compact length that keeps the upper handy.
• The barrel is chrome-lined carbon steel, a lining that resists wear and corrosion in the bore.
• The barrel is button rifled, a rifling method known for consistent, smooth bores.
• Rate of twist is 1:7 right-hand, which stabilizes the common range of 5.56 bullet weights.
• The gas system is direct gas impingement, the classic AR-15 operating system.
• The handguard is a 10.5-inch free-floating aluminum M-LOK design, which isolates the barrel and adds mounting slots for accessories.
• The bolt carrier group is a full-auto profile design, a mil-spec carrier shape known for reliable cycling.
• The sights are folding Magpul MBUS 3 adjustable sights, which fold flat when you mount an optic.
• The kit is a complete upper, built by Colt from its Enhanced Patrol Rifle II line to mate to an AR-15 lower.

Frequently Asked Questions

What is included in the upper kit? The kit is a complete upper with the 11.5-inch barrel, a 10.5-inch free-floating M-LOK handguard, a full-auto profile bolt carrier group and folding Magpul MBUS 3 sights.

What twist rate and barrel does it use? It uses a chrome-lined, button-rifled carbon steel barrel with a 1:7 right-hand twist in 5.56 NATO.

Does it have iron sights? Yes. It comes with folding Magpul MBUS 3 adjustable sights, so you can use irons or fold them down for an optic.

Buy the Colt LE6933 EPR II Complete Upper Kit, 5.56 NATO, 11.5-Inch with MBUS 3 Sights

Colt’s EPR II kit puts a duty-style short upper on any compatible lower without sourcing a dozen parts. Order it from our Lubbock, Texas gun shop for fast direct shipping, and browse more ar15 uppers.