FN FN15 Complete Lower 5.56 / .223 Rem
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FN America
Overview
The FN FN15 Complete Lower is a fully assembled lower receiver designed for the AR-15 platform, specifically chambered in 5.56 NATO. This component includes all necessary parts for operation, allowing builders to easily pair it with an upper receiver of their choice, making it ideal for both novice and experienced gun enthusiasts. You'll typically find this lower in builds focused on the 5.56 NATO caliber, emphasizing versatility and performance in a variety of shooting applications.
Specifications
Build history on GunPartPicker
Builders have been adding the FN America FN FN15 Complete Lower 5.56 / .223 Rem to their builds on GunPartPicker since February 2026. All time, it ranks #346 of the 1,135 lower receivers builders have added. Builds with this lower receiver are nearly all chambered in 5.56 NATO, split between carbine-length (50%) and mid-length (25%) gas systems, 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 $403.99 at KY Gun Company 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
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EOTECH 3x30.5mm X 21.6mm Holographic Hybrid Green Dot Sight - HHSGRN
Aero Precision M4E1 Threaded 350 Legend Assembled Upper Receiver - M4E1 Threaded Assembled Upper 350 Legend 16" QPQ Carbine FDE
Fortis SHIFT Vertical Grip - M-LOK
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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