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FN 15® Military Collector M4

Available for commercial and law enforcement.

MSRP: $1,929.00

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Own a piece of firearm history from the makers of the world’s most battle-proven firearms. The FN 15® Military Collector Series M4 brings to market a military replica rifle made to FN’s, and the U.S. military’s exacting specifications. The semi-automatic rifle is chambered in 5.56x45mm NATO and features a 14.7 inch barrel with permanently attached compensator (16″ overall length). The barrel is button-broached, has a 1:7 RH twist and is chrome-lined. The UID-labeled lower receiver is equipped with an ambidextrous selector switch, just like its select-fire big brother, the M4A1.

FN 15® Military Collector M4 Product Sell Sheet



  • Caliber: 5.56x45mm
  • Operation: Direct impingement
  • Mag Capacity: 30 Rd.
  • Weight: 6.6 lb.
  • Barrel Length: 16” Overall Length, has permanently attached compensator
  • Overall Length: 30.5" - 34.2"
  • Sights: A2-style front, adjustable rear sight
  • Twist Rate: 1:7 RH
  • Stock Color: Matte black


Semi-automatic only

Ambidextrous selector


Hard-anodized aluminum

Flat-top receiver

MIL-STD-1913 rail at the 12 o’clock position

UID label


16” overall length, button-broached, chrome-lined

A2-style compensator (permanently attached), actual barrel length 14.7”


Collapsible, 6-position with sling mount

Knights Armament M4RAS Adapter rail with rail adapter covers

A2 pistol grip


Ergonomic magazine release

Forward assist


Aluminum body

Low-friction follower