Building your own AR-15 can be a rewarding experience, offering customization and cost savings. This guide focuses on building an AR-15 using parts from Palmetto State Armory (PSA), a popular choice for budget-conscious builders. We'll cover the process step-by-step, offering tips and considerations along the way. Remember, always prioritize safety and follow all applicable laws and regulations.
Choosing Your PSA AR-15 Lower Receiver
The lower receiver is the heart of your AR-15, containing the serial number and fire control group. PSA offers various lower receivers, from basic models to those with enhanced features like ambidextrous controls or different finishes.
Key Considerations:
- Material: Most PSA lowers are made from 7075-T6 aluminum, a durable and reliable choice.
- Finish: Anodized finishes protect against corrosion. Consider the aesthetic appeal and durability of different finishes (e.g., black, grey, FDE).
- Features: Decide if you need ambidextrous controls (e.g., safety selector, bolt release) or other features that enhance ergonomics or functionality.
Selecting the Right Lower for Your Build
Choosing the right lower is crucial. Here's a breakdown to help you decide:
| Feature | Description | PSA Options |
|---|---|---|
| Material | The material from which the lower is made. | 7075-T6 Aluminum (Most common) |
| Finish | The surface treatment to protect against wear and corrosion. | Anodized Black, Anodized Grey, Cerakote, etc. |
| Features | Additional features, such as ambidextrous controls or enhanced ergonomics. | Standard, Ambidextrous, Enhanced |
| Price Point | The cost of the lower receiver. | Varies greatly depending on features. |
Assembling the Lower Receiver
This section focuses on the assembly of the lower receiver, a crucial step in building your PSA AR-15. Accuracy and precision are critical here.
Installing the Fire Control Group (FCG)
The FCG is the heart of your firearm's firing mechanism, allowing you to control the rate of fire and trigger function.
- Prep the FCG: Inspect your FCG components (hammer, trigger, disconnector, etc.) for any defects.
- Install the Hammer and Trigger Pins: Insert the hammer and trigger pins and install the trigger and hammer. Use a punch and hammer to carefully seat the pins.
- Install the Disconnector: Insert the disconnector and ensure it's correctly seated.
- Install the Bolt Catch: Position the bolt catch and install it.
Connecting the Buffer Tube and Stock
- Install the Buffer Tube: Screw the buffer tube onto the receiver extension. Ensure it's securely tightened.
- Install the Castle Nut: Tighten the castle nut using the appropriate wrench to prevent shifting during firing.
- Attach the Stock: Attach your chosen stock (e.g., fixed, collapsible, adjustable) to the buffer tube.
Building the Upper Receiver
The upper receiver houses the barrel, bolt carrier group, and charging handle. Careful assembly is vital for proper function and safety.
Installing the Barrel and Gas Tube
- Install the Barrel Nut: Use a wrench to carefully tighten the barrel nut, ensuring proper torque.
- Install the Gas Tube: Align the gas tube and attach it to the barrel and upper receiver, ensuring a secure connection.
Assembling the Bolt Carrier Group (BCG)
The BCG is a crucial part, responsible for cycling the action. PSA offers different BCG options, including those made from different materials and with varying finishes.
- Inspect the BCG: Before assembling, inspect all parts for damage or defects.
- Install the Bolt: Install the bolt into the bolt carrier group, ensuring it's correctly aligned.
- Lubrication: Apply a high-quality gun lubricant to the BCG.
Completing Your PSA AR-15 Build
This involves final assembly and function checks. Remember, safety is paramount, and proper assembly is crucial for reliable operation.
Final Assembly
- Attach the Upper and Lower Receivers: Carefully align the upper and lower receivers, and push them together. They should fit together smoothly.
- Install the Charging Handle: Insert the charging handle into the upper receiver and test its functionality.
- Test Fire: Once assembled, take your AR-15 to a shooting range, ensuring you follow all safety protocols. Begin with a function check to ensure proper operation before firing multiple rounds.
Maintaining Your PSA AR-15
Regular cleaning and maintenance are vital to ensure your AR-15's longevity and reliable performance.
Cleaning and Lubrication
Cleaning your AR-15 after each shooting session is recommended. Use a quality gun cleaning kit and appropriate solvents and lubricants. Pay particular attention to the BCG and barrel.
Conclusion: Your Custom PSA AR-15
Building a PSA AR-15 is a rewarding experience, allowing for significant customization and potential cost savings. Remember always to prioritize safety and follow all applicable laws and regulations. This detailed guide provides a solid foundation for your build. However, if you lack experience, consider seeking guidance from experienced builders or professionals.