CMMG Mk4LE 5.56 AR-15 Upper Receiver Group

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CMMG Mk4LE 5.56 AR-15 Upper Receiver Group

The CMMG Mk4LE 5.56 AR-15® Upper Receiver Group features a 16.1", M4 profile, 4140 chrome-moly steel barrel. A salt bath nitrided finish is applied to the barrel inside and out, along with the front sight base for improved wear, abrasion, and corrosion resistance. The Mk4LE comes with a M4 hand guard, and an "F" marked front sight base, which is the correct height for a flat top receiver and the detachable carry handle or folding rear sight. The CMMG Mk4LE 5.56 AR-15 Upper Receiver Group is chambered for the 5.56x45mm NATO cartridge, and has a 1:7" twist (also shoots .223 Rem.)
Manufacturer model #: 55BE1F0/10218.

  • M4 profile, chrome-moly steel barrel
  • Salt bath nitrided finish
  • "F" marked front sight base
  • M4 hand guard
Web ID: 1411191040