Building your own AR-15 lower parts kit can be a rewarding experience, allowing for customization and a deeper understanding of your firearm. This comprehensive guide will walk you through the process, covering everything from selecting components to the final assembly. Remember to always check your local, state, and federal laws regarding firearm ownership and assembly before starting this project. This information is for educational purposes only and should not be considered legal advice.
Understanding the AR-15 Lower Receiver
The lower receiver is the serialized part of the AR-15, considered the firearm itself by the ATF. This is the component that requires registration in many jurisdictions. You cannot build this part yourself; it must be purchased as a legally manufactured receiver. This guide focuses on assembling the parts kit which fits into the lower receiver.
Choosing Your Lower Parts Kit Components
The quality of your components directly impacts the reliability and longevity of your build. Here's a breakdown of the essential parts and considerations:
1. Lower Parts Kit: The Core Components
A complete lower parts kit typically includes:
- Trigger: The heart of the firing mechanism. Consider the type of trigger you prefer – single-stage, two-stage, or enhanced. Different triggers offer varying levels of pull weight and feel.
- Hammer: Strikes the firing pin, igniting the primer.
- Disconnector: Prevents the firearm from firing automatically.
- Bolt Catch: Locks the bolt open after the last round is fired.
- Ejector: Removes spent casings from the chamber.
- Hammer Pin: Securely holds the hammer in place.
- Trigger Pin: Secures the trigger and disconnector.
- Safety Selector: Controls the firing capability of the weapon.
- Grip Screw: Attaches the pistol grip to the lower receiver.
- Pistol Grip: Provides a comfortable and secure grip.
- Buffer Retainer Pin: Holds the buffer retainer in place.
- Takedown Pins: Allow for easy disassembly and cleaning.
Note: Some kits may include additional components like a magazine catch or a buffer tube. Always verify the kit's contents against your needs.
2. Selecting Quality Components
Investing in high-quality components from reputable manufacturers is crucial. Look for parts made from durable materials like hardened steel and properly finished to prevent corrosion and wear. Research different brands and read reviews to make informed decisions.
3. Beyond the Basic Kit: Consider these Upgrades
- Enhanced Triggers: Upgraded triggers can significantly improve your shooting experience with smoother pulls and crisper breaks.
- Ambidextrous Safety Selectors: Allow for easier operation by both left and right-handed shooters.
- Enhanced Bolt Catches: More robust bolt catches can improve reliability and longevity.
Assembling Your Lower Parts Kit
Once you have all the necessary components, you can begin assembly. While there are numerous videos available online demonstrating the process, remember that accuracy and attention to detail are paramount. Incorrect assembly can lead to malfunction and even dangerous situations.
Step-by-Step Assembly (General Outline):
This is a simplified outline; refer to detailed visual guides for proper assembly.
- Install the Hammer and Trigger Pins: Use a punch to carefully install these pins, ensuring proper alignment.
- Install the Trigger and Disconnector: Carefully position these parts and secure them with the pins.
- Install the Safety Selector: Insert the safety selector lever and ensure it moves freely between positions.
- Install the Bolt Catch: Position the bolt catch and ensure it functions correctly.
- Install the Ejector: Carefully install the ejector.
- Install the Pistol Grip and Grip Screw: Attach the pistol grip securely.
- Install the Buffer Tube (if applicable): This is usually a separate step.
- Final Inspection: Carefully inspect all components to ensure they are properly installed and function correctly.
Maintaining Your AR-15 Lower Receiver
Regular cleaning and maintenance are essential to ensure your firearm's reliability and longevity. Follow manufacturer recommendations for cleaning and lubrication. Keep the firearm stored properly to prevent rust and corrosion.
Conclusion
Building your own AR-15 lower parts kit is a rewarding endeavor. However, it requires patience, attention to detail, and a thorough understanding of firearm mechanics. Remember to prioritize safety and always consult detailed visual instructions and resources to ensure a successful build. Always adhere to all local, state, and federal laws.
