FN USA FN 15 Military Collector Series M16A4 Complete Upper Receiver Assembly 5.56mm 20″ Barrel
$1,568.55
Authentic reproduction M16A4 upper receiver assembly from FN USA. Features a 20-inch chrome-lined barrel chambered in 5.56x45mm NATO.
Out of stock
Own a piece of firearm history from the makers of the world’s most battle-proven firearms. The FN 15® Military Collector Series M16 upper receiver assembly is an authentic reproduction of the original made to FN’s and the U.S. military’s exacting specifications. A 20-inch 1:7 RH button-broached barrel is chrome-lined and chambered in 5.56x45mm NATO. The upper is furnished with a complete M16-style MIL-SPEC bolt carrier group including a HPT/MPI-tested bolt made from Carpenter 158 steel. A Knight’s Armament M5RAS quad-rail and adapter covers finish off the authentic reproduction making a perfect match for any M16-style build.
- CALIBER: 5.56x45mm
- WEIGHT: 5.61 Lbs.
- BARREL LENGTH: 20"
- OPERATION: DIRECT IMPINGEMENT RIFLE LENGTH GAS SYSTEM
- TWIST RATE: 1:7 RH
- SIGHTS: A2-style front adjustable rear sight
| Weight | 7.500 lbs |
|---|---|
| Dimensions | 31.500 × 9.850 × 3.750 in |
| Manufacturer | FN America |
| Action | Direct Impingement |
| Caliber | 5.56x45mm |
| Barrel Length | 20″ |
| Weight | 5.61 Lbs |
| Twist Rate | 1:7 RH |
PROCESSING & SHIPPING
Orders typically ship within 1–3 business days (Monday–Friday) after payment and all required documentation are received. Time to arrival after shipment depends on the carrier. Shipping method is at BT Gun Company’s discretion; ammunition and oversized accessories are charged at actual shipping cost. We do not ship to Hawaii or Alaska.
FIREARM TRANSFERS
- Firearms must ship to a licensed FFL dealer of your choosing — confirm with them first that they can accept the transfer.
- Your receiving FFL will need to email their license to [email protected] before we can ship.
- Inspect your firearm at your FFL’s location before signing ATF Form 4473 — once signed, the firearm is considered accepted.
You’re responsible for knowing the firearms laws in your state before ordering. For complete shipping, returns, and restocking-fee policy details, see our Shipping & Returns page.
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