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FN 15® DMR3 Upper Assembly

Complete Upper Receiver Assembly

MSRP: $1,354

The NEW FN 15® DMR3 Upper receiver enables you to keep on target for faster shot-to-shot recovery by the combination of the 18-inch hybrid profile barrel, rifle-length gas system, and SureFire ProComp muzzle brake that greatly reduces both recoil impulse and muzzle rise. At the heart of this upper receiver is the FN hammer forged, 18-inch, 1:8 twist, chrome lined barrel. The barrel has FN’s Hybrid profile that provides the stiffness and heat absorption needed for accurate, high volume shooting. Long barrel life is achieved by hammer forging from FN’s proprietary “machine gun barrel” steel and chrome lining. The rifle also features a fully free-floated Hodge Defense-designed wedge lock handguard, a low-profile gas block that is pinned to the barrel, HP/MPI-tested and certified bolt and M16-style bolt carrier group for complete reliability and performance.

Sell Sheet

20-100749FN DMR3 Upper Assembly845737015978


  • Caliber: 5.56x45mm
  • Weight: 5.15 Lbs.
  • Barrel Length: 18"
  • Twist Rate: 1:8 RH


FN Handguard with Hodge Defense-designed wedge-lock technology and proprietary barrel nut for an extremely rigid setup that allows for a fully free-floated barrel.

Radian Ambidextrous Charging Handle

M16-style MIL-SPEC bolt carrier group and HPT/MPI-tested bolt made from Carpenter 158

Rifle-length gas system with H buffer and pinned gas block


Extremely rigid 14 5/8-in Hodge Defense-designed wedge lock handguard composed of 6061 aluminum with proprietary barrel nut and anti-rotation technology resulting in minimal deflection

Continuous Picatinny rail at 12 o’clock position

Multiple M-LOK slots at 3, 6, 9 o’clock positions for lights, lasers and other accessories.


Fully free-floated 18-inch Hybrid profile barrel with 1:8 twist, Chrome-lined for longevity

FN Proprietary CMV barrel steel

High Pressure tested, MPI after proof firing

SureFire ProComp muzzle brake