Aero Precision M5 Build

4 min read 04-02-2025

Building your own AR-15 can be a rewarding experience, allowing for customization and a deeper understanding of your firearm. Aero Precision's M5 platform offers a solid foundation for a high-quality build, known for its affordability and reliable components. This guide will walk you through the process of building an Aero Precision M5, covering everything from selecting parts to final assembly. We'll cover common questions and potential pitfalls along the way, making this a complete resource for your Aero M5 build.

Choosing Your Aero Precision M5 Lower Receiver

The lower receiver is the heart of your AR-15, housing the fire control group and accepting the upper receiver. Aero Precision offers several variations of their M5 lower, including stripped lowers (requiring additional parts), and complete lowers (with the fire control group installed).

Stripped Lower: This option gives you complete control over the build, allowing you to select your own trigger, safety selector, and other components. This is the preferred choice for those who want maximum customization.
Complete Lower: A more convenient option for beginners, these lowers come pre-assembled with a fire control group. This can save time and potentially money, depending on the cost of individual parts. Aero's complete lowers are generally well-regarded for quality.

Consider these factors when choosing your lower:

Material: Most Aero Precision lowers are made from 7075-T6 aluminum, a strong and durable material suitable for AR-15 builds.
Finish: Anodized finishes are common and provide protection against corrosion. Cerakote finishes offer even greater durability and customization options.
Features: Some lowers might include features like ambidextrous safety selectors or enhanced ergonomics.

Selecting Your Upper Receiver

The upper receiver houses the barrel, bolt carrier group, and charging handle. Aero Precision's M5 upper receivers are known for their precision and compatibility with various components. When selecting your upper, you'll need to consider:

Material: Similar to the lower, the upper receiver is usually made of 7075-T6 aluminum.
Finish: Anodized or Cerakote finishes offer corrosion protection and a customized look.
Type: You'll want an upper receiver that is compatible with your chosen barrel length and gas system (Direct Impingement or Piston).

Essential Components for Your Aero Precision M5 Build

Once you have the upper and lower receivers, you'll need several other key components to complete your build. This list includes:

Barrel: Choose a barrel length and profile that suits your intended use. Shorter barrels are more maneuverable but may have increased recoil. Longer barrels offer greater accuracy and range. Consider the twist rate, which affects bullet stability.
Bolt Carrier Group (BCG): This is a critical component; it cycles the action and chambers rounds. Choose a high-quality BCG from a reputable manufacturer, like Aero Precision.
Charging Handle: This component allows you to manually cycle the bolt. Consider different styles depending on your preference.
Gas Tube: This connects the gas block to the upper receiver.
Handguard: This protects the barrel and provides a place to attach accessories. Aero Precision offers several handguard options, including M-LOK and KeyMod compatible models.
Buffer Tube: This houses the buffer spring and recoil buffer.
Buffer Spring and Recoil Buffer: These absorb recoil and help cycle the action. Correct weight is critical for reliable function.
Stock: Choose a stock that is comfortable and fits your build. Numerous styles are available.
Trigger: This is a key component that determines how your rifle feels and shoots. Numerous trigger options exist, from budget-friendly to high-end competition triggers. Choosing the right trigger is crucial for accuracy and comfort.
Pistol Grip: This provides a comfortable grip for the shooter.
Magazine: AR-15 magazines are standardized, allowing for broad compatibility. Choose magazines from well-known manufacturers.
Gas Block: This is a crucial part of the gas system, regulating how much gas is diverted to the bolt carrier group. Low-profile gas blocks are common and easily fit most handguards.
Sights or Optics: Choosing between iron sights or an optic (red dot, scope, etc.) will depend on your budget and intended use.

Assembling Your Aero Precision M5: A Step-by-Step Guide

This section provides a general overview; consult your specific component instructions for detailed procedures.

Assemble the lower receiver: This involves installing the fire control group, pistol grip, buffer tube, and stock.
Install the barrel and gas system: This usually involves inserting the barrel into the upper receiver and securing it with a barrel nut.
Install the BCG and charging handle: Once the barrel is installed, the bolt carrier group and charging handle can be added.
Install the handguard: Secure the handguard to the upper receiver, ensuring proper alignment and fit.
Attach the upper and lower receivers: Carefully align the upper and lower receivers and tighten the takedown pins.
Install optics or sights: Mount your chosen sights or optics according to the manufacturer's instructions.

Safety Precautions: Always handle firearms responsibly. Never point a firearm at anything you are not willing to destroy. Ensure that the firearm is unloaded before any assembly or disassembly.