How To Build An AR-15?

How To Build An AR-15?: A Comprehensive Guide

Building an AR-15 allows for customization and a deeper understanding of its mechanics; however, it’s crucial to understand all legal requirements. This guide outlines the process of how to build an AR-15, enabling enthusiasts to craft a personalized firearm while adhering to federal and local regulations.

Introduction: The Appeal of Building Your Own AR-15

The AR-15, or ArmaLite Rifle Model 15, is one of the most popular rifles in the United States. Its modular design makes it incredibly versatile and customizable. While purchasing a pre-built AR-15 is common, building one offers several advantages. Many firearm enthusiasts enjoy the process of assembling their own rifle, gaining a deeper understanding of its inner workings, and tailoring it to their specific needs and preferences. Furthermore, building may, in some cases, offer cost savings. This article serves as a comprehensive guide on how to build an AR-15, covering everything from necessary components to safety precautions.

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Legal Considerations

Before embarking on the journey of building an AR-15, it’s crucial to understand the legal requirements involved. Federal, state, and local laws govern the ownership and assembly of firearms. It is your responsibility to fully understand and comply with these laws.

• Federal Regulations: The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) regulates firearms in the United States. Federal law dictates the types of firearms that are legal to own and the process for acquiring them. Building an AR-15 typically does not require a federal license, unless you intend to sell it commercially.
• State and Local Laws: State and local laws vary significantly. Some states have stricter regulations regarding AR-15s, including restrictions on magazine capacity, barrel length, and other features. Some may ban specific parts or the rifle altogether.
• The Lower Receiver: The lower receiver is the part of the AR-15 that is legally considered the firearm. It houses the fire control group and magazine well. When building an AR-15, you’ll either purchase a completed lower receiver (requiring a background check) or an 80% lower (which requires machining to complete, and potentially has other legal ramifications depending on the jurisdiction). It is essential to understand the laws surrounding 80% lowers in your area.
• Compliance: Ensuring compliance with all applicable laws is paramount. Consult with legal counsel or your local law enforcement to ensure you are following all regulations. Ignorance of the law is not a defense.

Required Components and Tools

Building an AR-15 requires a variety of components, each contributing to the rifle’s functionality. You’ll also need specific tools to assemble these parts correctly.

Essential Components:

• Lower Receiver
• Upper Receiver
• Lower Parts Kit (LPK)
• Upper Parts Kit (UPK)
• Bolt Carrier Group (BCG)
• Charging Handle
• Barrel
• Handguard
• Gas Block and Gas Tube
• Muzzle Device
• Buttstock Assembly
• Magazine

Necessary Tools:

• AR-15 Armorer’s Wrench
• Punch Set (roll pin punches)
• Hammer (preferably with a nylon or brass head)
• Bench Vise
• Vise Block (for the lower receiver and upper receiver)
• Torque Wrench
• Gunsmithing Screwdriver Set
• Roll Pin Installation Tool (optional, but highly recommended)
• Safety Glasses

Step-by-Step Assembly Process

The process of building an AR-15 can be broken down into several stages, each requiring careful attention to detail. Safety is paramount throughout the process. Always ensure the firearm is unloaded and safe before proceeding.

Lower Receiver Assembly:

1. Install the Bolt Catch: Use a punch to drive the bolt catch roll pin into place, securing the bolt catch.
2. Install the Magazine Release: Insert the magazine release button, magazine release spring, and magazine catch. Tighten the magazine catch until the magazine release button functions properly.
3. Install the Trigger and Hammer: Place the trigger into the lower receiver and secure it with the trigger pin. Then, install the hammer and secure it with the hammer pin.
4. Install the Safety Selector: Insert the safety selector and the safety selector detent and detent spring. Ensure the safety selector functions correctly.
5. Install the Pistol Grip: Attach the pistol grip using the pistol grip screw and ensure it is securely fastened.
6. Install the Buffer Tube Assembly: Screw the buffer tube into the lower receiver, ensuring proper alignment. Install the buffer, buffer spring, and castle nut.

Upper Receiver Assembly:

1. Install the Forward Assist: Insert the forward assist assembly into the upper receiver and tap the forward assist roll pin into place.
2. Install the Ejection Port Cover: Install the ejection port cover by first inserting the ejection port cover spring and then sliding in the ejection port cover itself. Secure it with the ejection port cover pin.
3. Install the Barrel: Insert the barrel into the upper receiver. Ensure proper alignment. Torque the barrel nut to the manufacturer’s recommended specification using a torque wrench.
4. Install the Gas Block and Gas Tube: Slide the gas block over the barrel. Align the gas block with the gas port on the barrel and secure it with the gas block set screws. Insert the gas tube into the gas block and secure it with the gas tube roll pin.
5. Install the Handguard: Install the handguard by sliding it over the barrel nut and securing it according to the handguard manufacturer’s instructions.
6. Install the Muzzle Device: Thread the muzzle device onto the barrel and tighten it using the armorer’s wrench. Ensure the muzzle device is properly timed if required.

Final Assembly:

1. Insert the Bolt Carrier Group (BCG): Slide the BCG into the upper receiver.
2. Install the Charging Handle: Insert the charging handle into the upper receiver.
3. Attach the Upper and Lower Receivers: Align the upper and lower receivers and push the takedown pins into place.
4. Function Check: Perform a complete function check to ensure all components are working properly. This is critical for safety.

Common Mistakes to Avoid

• Over-Torquing: Over-torquing screws or nuts can damage components. Always use a torque wrench and follow the manufacturer’s recommended specifications.
• Incorrect Pin Installation: Using the wrong size punch or applying excessive force can damage pins or the receiver. Use the correct tools and take your time.
• Ignoring Legal Requirements: Building an illegal firearm can have serious consequences. Understand and adhere to all applicable laws.
• Skipping Function Checks: Failing to perform a thorough function check can lead to malfunctions and potential safety hazards. Always perform function checks after assembly.

The Satisfaction of Completion

Learning how to build an AR-15 can be a rewarding experience, giving the builder deep insight into the operation and modularity of the rifle.

Frequently Asked Questions (FAQs)

Can I legally build an AR-15?

Yes, in most states, it is legal to build an AR-15 for personal use, as long as you comply with all federal, state, and local laws. This includes adhering to restrictions on barrel length, magazine capacity, and other features, as well as ensuring the firearm is not intended for sale or transfer to someone prohibited from owning it. However, some states have banned the AR-15 outright. Always consult with legal counsel to ensure compliance with the law.

What is an 80% lower receiver?

An 80% lower receiver is a partially manufactured lower receiver that is not yet considered a firearm under federal law. To complete an 80% lower receiver, you must machine it to a functional state. Some states and jurisdictions regulate or ban 80% lowers, so always check your local laws.

What are the most common mistakes people make when building an AR-15?

Common mistakes include over-torquing components, installing pins incorrectly, failing to perform function checks, and neglecting legal requirements. Using the correct tools and taking your time can help prevent these errors.

Do I need a gunsmith to build an AR-15?

No, you do not necessarily need a gunsmith to build an AR-15. With the right tools, instructions, and attention to detail, many people can successfully build their own AR-15. However, if you are uncomfortable with the process or lack the necessary tools, seeking professional assistance is always recommended.

How much does it cost to build an AR-15?

The cost of building an AR-15 can vary widely depending on the quality of the components and the level of customization. Generally, building an AR-15 can range from around $500 to $2000 or more. Researching component costs and setting a budget beforehand is advisable.

What is the purpose of the Bolt Carrier Group (BCG)?

The Bolt Carrier Group (BCG) is a critical component of the AR-15 that cycles the action, extracts spent casings, and chambers new rounds. A high-quality BCG is essential for reliable performance.

What is the difference between direct impingement and piston AR-15s?

Direct impingement AR-15s use gas pressure from the fired cartridge to directly cycle the bolt carrier. Piston AR-15s use a piston system to transfer the gas pressure to the bolt carrier. Piston systems are often perceived as running cleaner, while direct impingement is a more common and established design. The choice between the two depends on personal preference and intended use.

How do I choose the right barrel length for my AR-15?

The ideal barrel length depends on the intended use of the rifle. Shorter barrels (e.g., 10.5-14.5 inches) are more maneuverable and suitable for close-quarters combat, while longer barrels (e.g., 16-20 inches) offer greater accuracy and range. Consider your specific needs when selecting a barrel length.

What is the importance of a function check after assembling an AR-15?

A function check ensures that all components are working correctly and that the rifle is safe to operate. This includes checking the trigger pull, safety selector, magazine release, bolt catch, and firing pin. A thorough function check is crucial for preventing malfunctions and ensuring safety.

How do I properly maintain my AR-15 after building it?

Regular cleaning and lubrication are essential for maintaining an AR-15. This includes cleaning the barrel, BCG, and other components after each use, and applying lubricant to ensure smooth operation. Following a regular maintenance schedule will prolong the life of your rifle and ensure reliable performance.

What are some recommended upgrades for a newly built AR-15?

Common upgrades include enhanced triggers, improved grips, free-floating handguards, and upgraded optics. Choosing upgrades that enhance performance and comfort can improve the overall shooting experience.

Where can I find reliable information and resources for building an AR-15?

There are numerous online resources, including forums, videos, and articles, that provide information and guidance on building an AR-15. Seek reputable sources and verify information before proceeding. Consulting with experienced builders or gunsmiths can also be beneficial.