Fn Fn15/ar 20" Rifle Upper Receiver Assembly
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FN America
Overview
The FN FN15/AR 20" Rifle Upper Receiver Assembly is a complete upper designed for the AR-15 platform, featuring a 20-inch barrel optimized for 5.56 NATO caliber ammunition. Its rifle-length gas system provides smooth cycling and reliable operation, while the 1:7 twist rate ensures stability for a wide range of bullet weights. This upper is often found in builds that prioritize long-range accuracy and performance with the 5.56 NATO caliber.
Specifications
Available Merchants
No Available merchants at this time.
Frequently Built With
Based on build data
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Advanced Technology Ar-15 X1 Recoil Reducing Pistol Grip
Pistol Grip
PSA PA15 Complete Classic EPT A2 Lower Receiver - 7781023
Lower Receiver
Breek Arms Warhammer Mod2 Micro Latch Ar-15 Ambidextrous Charging Handle - Fde
Aero Precision M16a4 Clone Lower Receiver
Lower Receiver
Colt Ar-15 Adjustable Carrying Handle Assembly Black
Rear SightBuild Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
| Product | Category | Times Built Together |
|---|---|---|
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 2 |
| Advanced Technology Ar-15 X1 Recoil Reducing Pistol Grip | Pistol Grip | 1 |
| PSA PA15 Complete Classic EPT A2 Lower Receiver - 7781023 | Lower Receiver | 1 |
| Breek Arms Warhammer Mod2 Micro Latch Ar-15 Ambidextrous Charging Handle - Fde | 1 | |
| Aero Precision M16a4 Clone Lower Receiver | Lower Receiver | 1 |
| Colt Ar-15 Adjustable Carrying Handle Assembly Black | Rear Sight | 1 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 100% |
| Gas System | Percentage |
|---|---|
| Rifle | 100% |
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