Radical Firearms

Radical Firearms Complete AR-15 Lower Receiver

Radical Firearms Complete Ar-15 Lower Receiver - Lower Receiver for AR-15 - view 1
Radical Firearms Complete Ar-15 Lower Receiver - Lower Receiver for AR-15 - view 2
Radical Firearms Complete Ar-15 Lower Receiver - Lower Receiver for AR-15 - view 3
Radical Firearms Complete Ar-15 Lower Receiver - Lower Receiver for AR-15 - view 4
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This is a serialized firearm.

Radical Firearms

Overview

The Radical Firearms Complete AR-15 Lower Receiver is a fully assembled lower designed to streamline your build process. It features a hardcoat anodized finish for durability, and it's compatible with standard AR-15 components, including a trigger pin diameter of .154 inches. This lower receiver is frequently found in builds utilizing a mid-length gas system chambered in 5.56 NATO, making it a solid choice for those looking to create a reliable and versatile firearm.

Specifications

MPNFL-M4
Trigger Pin.154
FinishHardcoat Anodized
AssemblyComplete
PlatformAR-15

Available Merchants(1)

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Primary Arms
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$225
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Build history on GunPartPicker

Builders have been adding the Radical Firearms Complete AR-15 Lower Receiver to their builds on GunPartPicker since February 2026. All time, it ranks #218 of the 1,005 lower receivers builders have added. Builds with this lower receiver are nearly all chambered in 5.56 NATO, mostly on mid-length gas (67%, then pistol-length 33%), and nearly all AR-15.

Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today the one retailer we track has it in stock. Prices barely moved in September 2026, holding around $224.99, so there haven't been real sales lately. Buying today, the lowest price is $224.99 at Primary Arms, which matches the best price we saw in September.

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Frequently Built With

The part most often added in each category by the builds that include this one

Radical Firearms 5.56 Barreled AR-15 Upper - 16" - Primary Arms Exclusive

Radical Firearms 5.56 Barreled AR-15 Upper - 16" - Primary Arms Exclusive

Upper Receiverin 13% of them
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers

Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers

Charging Handle$80 · out of stockin 13% of them
Aero Precision AR-15 5.56 BCG W/C158 Bolt - Aero Logo - Phosphate

Aero Precision AR-15 5.56 BCG W/C158 Bolt - Aero Logo - Phosphate

Bolt Carrier Group$149 · out of stockin 6% of them
Magpul DT Carbine Stock - Mil-Spec - FDE - MAG1377-FDE

Magpul DT Carbine Stock - Mil-Spec - FDE - MAG1377-FDE

Stock & Brace$53in 6% of them
SIG Sauer Romeo 5 Elite Multi Reticle Red Dot With 1.41" Mount

SIG Sauer Romeo 5 Elite Multi Reticle Red Dot With 1.41" Mount

Optic$200in 6% of them
Magpul RVG Rail Vertical Grip - Black

Magpul RVG Rail Vertical Grip - Black

Foregrip$18in 6% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Gas System

66.7%
Mid-Length66.7%
Pistol33.3%

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