FN presents the FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly, a testament to precision engineering and historical authenticity. Crafted to FN's and the U.S. military's exacting standards, this assembly features a 20-inch chrome-lined barrel with a 1:7 RH twist rate, chambered in 5.56x45mm NATO. The MIL-SPEC bolt carrier group and Knight's Armament M5RAS quad-rail ensure reliability and ease of use.

Ideal for range time and training, this upper receiver assembly is perfect for enthusiasts seeking a piece of firearm history. FN is renowned for innovation and quality, making this assembly a valuable addition to any collection.

Key Features:
- Manufacturer: FN
- Model: FN 15 Military Collector Series M16A4
- Caliber: 5.56x45mm
- Barrel Length: 20"
- Operation: Direct Impingement Rifle Length Gas System
- Twist Rate: 1:7 RH
- Sights: A2-style front adjustable rear sight
- Weight: 5.61 lbs
- Color: Black
- Upper Type: Complete