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
Build history on GunPartPicker
Builders have been adding the FN America FN FN15/AR 20" Rifle Upper Receiver Assembly to their builds on GunPartPicker since February 2026. All time, it ranks #1061 of the 1,862 upper receivers builders have added. Builds with this upper receiver are nearly all chambered in 5.56 NATO, nearly all on rifle-length gas, and nearly all AR-15.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $809 at Brownells for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
PSA PA15 Complete Classic EPT A2 Lower Receiver - 7781023
Breek Arms Warhammer MOD2 Micro Latch AR-15 Ambidextrous Charging Handle - FDE
Advanced Technology AR-15 X1 Recoil Reducing Pistol Grip
Bravo Company Bolt Carrier Group Flat Dark Earth 5.56 / .300 AAC Blackout
POF USA Drop-In Single Stage Trigger 4.5lb - Curved - POF00457
V Seven Weapon Systems AR-15 57/90 Degree Ambidextrous Selector Raw
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