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5.56x45mm M4 Complete Lower Receiver

Original price was: $399.99.Current price is: $341.99.

5.56x45mm M4 Complete Lower Receiver is a mil-spec AR-15 lower assembly, compatible with 5.56 NATO/.223 Remington uppers – in stock and ships within 24 hours from Missouri.

SKU: c2d9ae861856 Category:

Description

This 5.56x45mm M4 Complete Lower Receiver is a precision-machined foundation for your AR-15 build. Crafted from forged 7075-T6 aluminum and finished with a MIL-SPEC hardcoat anodizing, it delivers exceptional durability and corrosion resistance. The receiver arrives fully assembled with a standard fire control group, ready for immediate pairing with your preferred mil-spec upper for a reliable, high-performance rifle.

Key Features

  • Forged from 7075-T6 aluminum for maximum strength and longevity.
  • MIL-SPEC hardcoat anodized finish provides superior wear and corrosion resistance.
  • Fully assembled with a standard semi-automatic trigger group and pistol grip.
  • Accepts all mil-spec AR-15 upper receivers and components.
  • Features a standard 6-position buffer tube for adjustable length of pull.

Specifications

Caliber / Type 5.56x45mm / Complete Lower Receiver
Material 7075-T6 Aluminum
Finish Black Hardcoat Anodized
Compatibility Mil-Spec AR-15 Uppers
Weight Approx. 2.4 lbs (assembled)

The 5.56x45mm NATO cartridge demands a robust platform. This lower’s 7075-T6 aluminum construction meets this need, offering a higher yield strength than common 6061 alloy. The hardcoat anodizing exceeds Type II specifications for enhanced surface hardness. When paired with a complete upper, this assembly forms a reliable system for sport shooting, training, and home defense applications.

✓ In Stock — Ships within 24h✓ Discreet Packaging✓ Secure Checkout✓ USA-Based

FAQ

Is the 5.56x45mm M4 Complete Lower Receiver legal?
This is a legal firearm component. It must be transferred through a licensed FFL dealer in compliance with all federal, state, and local laws. The receiver is the serialized part and is treated as a firearm.
What is it compatible with?
This complete lower is designed for use with any mil-spec AR-15 upper receiver chambered in 5.56x45mm NATO or .223 Remington. It also accepts standard mil-spec stocks, triggers, and other lower parts kit components.
How long does shipping take?
Orders ship within 24 hours from our US warehouse. Standard delivery is 3–7 business days. Expedited options available at checkout.

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