Introduction
The AR-10 platform represents a fascinating evolution in the world of firearms. Offering the power of larger cartridges within the familiar ergonomics of the AR-15, it has quickly become a favorite for those seeking greater range and terminal effectiveness. Whether for hunting, long-range shooting, or simply the satisfaction of owning a powerful rifle, the AR-10 offers a compelling array of possibilities.
Among the numerous options available to those venturing into the AR-10 world, Aero Precision’s M5 receiver set stands out. Known for its quality, compatibility, and reasonable price point, the M5 provides a solid foundation for building a custom AR-10. This guide is designed to provide a comprehensive overview of the *Aero Precision M5 build* process.
This guide aims to be more than just a parts list. We’ll delve into the considerations behind selecting each component, from the receiver set and barrel to the trigger and muzzle device. We will walk through the assembly step-by-step, equipping you with the knowledge and confidence to undertake your own *Aero Precision M5 build*. The benefits of building your own AR-10 are numerous, including the satisfaction of creating a firearm tailored to your specific needs, the potential for cost savings, and the enhanced understanding of how your rifle functions.
Choosing the Right Aero Precision M5 Parts
Embarking on an *Aero Precision M5 build* is a rewarding experience, but success begins with the careful selection of components. Understanding the various options and their implications is crucial to building a rifle that meets your performance goals and preferences.
The Aero Precision M5 Receiver Set Foundation
The heart of any *Aero Precision M5 build* is, of course, the receiver set. Aero Precision offers a variety of M5 receiver sets, each with its own unique features and aesthetics. The most common sets include the upper receiver and lower receiver. The beauty of the M5 is that it is built to be compatible with many AR-10 standard parts, which makes it easy to make upgrades or replace damaged parts. Choosing a set is often a matter of personal preference in terms of features and finish. When choosing your set consider the included features, such as upper receiver enhancements, and whether you would like to use a forward assist.
Selecting the Barrel: Accuracy and Performance
The barrel is arguably the most critical component influencing a rifle’s accuracy and performance. When choosing a barrel for your *Aero Precision M5 build*, consider these factors:
Barrel Length: Longer barrels generally yield higher muzzle velocities, resulting in increased effective range and flatter trajectories. However, longer barrels also add weight and can impact maneuverability. Common barrel lengths include sixteen, eighteen, and twenty inches. The barrel length is a primary determiner for the rifle’s intended use. Consider the distances you plan to be shooting.
Twist Rate: The twist rate determines the stability of the bullet in flight. Match the twist rate to the bullets you intend to use. For example, a one-in-ten-inch twist rate is typically suitable for heavier .308 Winchester bullets, while a one-in-eleven-and-a-quarter-inch twist rate may work better with lighter bullets.
Material: Barrel materials significantly affect the lifespan and accuracy potential of a barrel. 4150 Chrome Moly Vanadium steel offers a good balance of durability and cost. Stainless steel is a popular choice for match-grade barrels due to its resistance to corrosion and its ability to hold tighter tolerances.
Profile: The barrel profile affects weight and balance. Heavy barrels offer greater accuracy and heat resistance but add weight. Light barrels are lighter and more maneuverable but may heat up more quickly during sustained firing.
The Bolt Carrier Group: Reliability is Key
The bolt carrier group (BCG) is the heart of the AR-10’s operating system. A reliable BCG is essential for smooth and consistent cycling. When selecting a BCG for your *Aero Precision M5 build*, consider these factors:
Material and Finish: Choose a BCG made from high-quality steel. Finishes such as nitride or phosphate can enhance durability and corrosion resistance.
Compatibility: Ensure the BCG is designed for the .308 Winchester/7.62x51mm NATO cartridge.
Reputation: Buy from a reputable manufacturer known for producing reliable BCGs.
Gas Key: The gas key is a crucial part of the BCG, responsible for properly directing the gases back into the system. Ensure that the gas key is properly staked and that it is compatible with the gas block selected.
Handguard Options: Ergonomics and Accessories
The handguard provides a comfortable grip and a platform for mounting accessories. Handguards for your *Aero Precision M5 build* come in various designs:
M-LOK: This system allows for attaching accessories directly to the handguard using M-LOK slots. M-LOK is becoming a standard for its simplicity and versatility.
KeyMod: This system offers an alternative method of attaching accessories. It is less common than M-LOK now, but still has many accessories available.
Quad Rail: This system provides rails on all four sides for attaching accessories. Quad rails offer maximum mounting options but are often heavier and bulkier.
Consider the handguard length and its compatibility with your barrel length, gas system, and preferred accessories when selecting your handguard.
Gas System: Tuning for Optimal Performance
The gas system plays a vital role in the reliability and felt recoil of your AR-10.
Gas System Length: The length of the gas system (rifle, mid-length, or carbine) affects the timing of the gas cycle. Longer gas systems generally offer softer recoil impulse but may require a longer handguard. The gas system length also influences the dwell time, which is important for reliable function.
Gas Block: Choose a quality gas block that is compatible with your barrel and handguard. Consider an adjustable gas block if you plan to fine-tune the rifle’s gas system.
Gas Tube: Select a gas tube of the correct length and material for your gas system.
The Trigger: Accuracy and Control
A good trigger enhances accuracy and provides a more enjoyable shooting experience.
Trigger Type: Choose between a standard mil-spec trigger or an aftermarket trigger. Upgraded aftermarket triggers often provide a lighter and crisper pull.
Trigger Pull Weight: Consider the trigger pull weight that best suits your shooting style and intended use.
Installation: Be sure to properly install the trigger to ensure its functionality and safety.
Lower Parts Kit: Functionality and Reliability
The lower parts kit (LPK) includes the small parts needed to complete the lower receiver. Choose a quality LPK from a reputable manufacturer. The LPK includes parts like the trigger components, safety selector, bolt catch, magazine release, and all associated springs and pins.
Stock and Buffer System: Comfort and Recoil Management
The stock and buffer system contribute to both comfort and recoil management.
Stock Type: Choose a stock that fits your shooting style and body type. Options include adjustable stocks for easy adjustment of length of pull.
Buffer Tube Length and Buffer Weight: Choose the appropriate buffer tube length and buffer weight for your setup. Using the correct components is crucial to reliable cycling.
Buffer Spring: The buffer spring works in conjunction with the buffer to absorb recoil.
Other Important Parts to Remember
Don’t overlook the importance of the remaining components:
Charging Handle: Consider an upgraded charging handle for enhanced grip and ease of use.
Muzzle Device: Choose a muzzle device, such as a flash hider, compensator, or suppressor, to manage recoil and muzzle flash.
Optics: Select an optic that suits your intended use. Consider a scope with appropriate magnification for long-range shooting.
Magazines: Make sure to use magazines that are compatible with the .308 Winchester/7.62x51mm NATO cartridge.
Step-by-Step Aero Precision M5 Build Guide
With all the necessary parts assembled, it’s time to start your *Aero Precision M5 build*.
Lower Receiver Assembly: Putting it All Together
This section will provide a step-by-step process for assembling the lower receiver.
1. Install the Trigger Components: Carefully install the trigger, hammer, and associated springs and pins into the lower receiver. Ensure the trigger moves smoothly and the hammer is properly cocked.
2. Install the Safety Selector: Insert the safety selector and the corresponding detent and spring. Make sure the safety engages and disengages correctly.
3. Install the Bolt Catch: Insert the bolt catch, bolt catch spring, and bolt catch roll pin. Ensure the bolt catch functions properly.
4. Install the Magazine Release: Install the magazine release button, spring, and catch. Check that the magazine release button smoothly releases the magazine.
5. Install the Pistol Grip: Attach the pistol grip to the lower receiver.
6. Install the Buffer Tube: Screw the buffer tube into the lower receiver.
7. Install the Stock: Attach the stock to the buffer tube.
8. Torque Specifications: Refer to a torque chart for the correct torque specifications for each component. Over-tightening can cause damage, while under-tightening can lead to malfunctions.
Upper Receiver Assembly: The Heart of the Rifle
The upper receiver assembly involves these important steps:
1. Install the Barrel: Install the barrel into the upper receiver and hand-tighten the barrel nut.
2. Install the Barrel Nut: Torque the barrel nut to the manufacturer’s specifications, often using a specialized barrel nut wrench.
3. Install the Handguard: Mount the handguard on the upper receiver.
4. Install the Gas Block: Attach the gas block to the barrel, ensuring it is correctly aligned with the gas port.
5. Install the Gas Tube: Insert the gas tube into the gas block and the upper receiver.
6. Install the Muzzle Device: Install the muzzle device.
Final Assembly and Testing
Now, the upper and lower receivers can be joined, and the rifle is almost complete.
1. Connect the Upper and Lower Receivers: Attach the assembled upper receiver to the lower receiver.
2. Function Check: Check the functionality of all the components. Cycle the charging handle, ensure the bolt locks back on an empty magazine, and check the function of the safety.
3. Bore Sighting (Optional): If using an optic, bore sight the rifle to get on paper.
4. Test Firing and Break-In: Fire several rounds, making sure the rifle functions smoothly. Break in the rifle according to the manufacturer’s recommendations.
5. Troubleshooting: Be prepared to troubleshoot any issues that may arise.
Tools and Equipment: Essential for the Build
A successful *Aero Precision M5 build* requires a set of quality tools.
Vise and Vise Blocks: Use a vise to hold the receiver during assembly.
Armorer’s Wrench: The armorer’s wrench is crucial for installing and removing the barrel nut.
Punch Set: Use punches to install and remove roll pins and other components.
Torque Wrench: A torque wrench ensures components are tightened to the correct specifications.
Headspace Gauges: Essential for measuring the headspacing.
Tips, Tricks, and Considerations
Building your own AR-10, or an *Aero Precision M5 build*, is an involved project.
Prioritizing Safety
Firearm safety is the utmost priority. Always keep the muzzle pointed in a safe direction. Always treat every firearm as if it were loaded.
Understanding Headspacing
Headspacing is critical to safety and function. Ensure that the bolt fully closes on a loaded cartridge and that it does not close on a “no-go” gauge.
Torque Specifications are Key
Refer to the manufacturer’s specifications for critical torque values.
Addressing Common Issues
Common issues include failure to feed, failure to eject, or failures to lock the bolt back.
Customization and Future Upgrades
The AR-10 platform offers many opportunities for upgrades, from enhanced bolt carrier groups to match-grade barrels and high-quality optics.
Cost Analysis and Budgeting
The cost of an *Aero Precision M5 build* varies depending on the parts selected. Budgeting allows you to manage the overall project cost.
Conclusion
Building an *Aero Precision M5 build* can be a satisfying experience. By carefully selecting the components, following the assembly steps, and paying attention to detail, you can build a powerful, accurate, and reliable AR-10 tailored to your needs.
Now that you have the knowledge to complete an *Aero Precision M5 build* it is time to put your skills to the test.
