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 #834 of the 1,566 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 August 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 31 retailers
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Read the guide: Most Popular AR-15 Upper Receivers →Frequently Built With
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