How to Build an AR-15 Lower Receiver
Building an AR-15 lower receiver is a rewarding and fulfilling project for gun enthusiasts and hobbyists alike. The lower receiver is the heart of an AR-15 rifle, as it houses the trigger mechanism, magazine well, and the grip. This article will guide you through the steps of building an AR-15 lower receiver, from selecting the right parts to assembling them properly.
1. Selecting the Right Parts
The first step in building an AR-15 lower receiver is to gather all the necessary components. You will need the following:
– Lower receiver blank or receiver kit
– Trigger group
– Fire control housing and pin
– Hammer, sear, and spring
– Safety selector and detent
– Pistol grip
– Magazine catch and spring
– Buffer tube and spring
– Buffer retainer pin
– Stock
– M16 bolt carrier group (BCG)
– Charging handle
– Magazine
2. Machining the Lower Receiver
If you have purchased a lower receiver blank, you will need to machine it to create the proper fit and finish. This involves using a milling machine to remove excess material and create the magazine well, grip, and trigger guard. Be sure to follow the manufacturer’s specifications for dimensions and tolerances.
3. Installing the Trigger Group
Once the lower receiver is machined, install the trigger group. This involves aligning the fire control housing with the hammer, sear, and spring. Make sure the trigger is properly seated and that the safety selector functions correctly.
4. Assembling the Fire Control Mechanism
Install the hammer, sear, and spring into the fire control housing. Make sure the parts are aligned and functioning correctly. Attach the safety selector and detent, and ensure it is securely seated in the fire control housing.
5. Installing the Pistol Grip and Magazine Catch
Attach the pistol grip to the lower receiver, making sure it is securely fastened. Next, install the magazine catch and spring. This will allow the magazine to be loaded and unloaded from the rifle.
6. Mounting the Buffer Tube and Stock
Install the buffer tube and spring into the lower receiver, ensuring that it is properly seated. Then, attach the stock to the buffer tube. This will allow you to adjust the length of pull and shoulder stock for a comfortable fit.
7. Assembling the Bolt Carrier Group and Charging Handle
Attach the M16 bolt carrier group to the lower receiver. Ensure that the charging handle is properly seated and functions smoothly. Make sure the bolt carrier group is properly tensioned and that the extractor and ejector are in place.
8. Final Assembly and Inspection
Once all the components are assembled, inspect the lower receiver to ensure that all parts are functioning correctly. Check the trigger pull, magazine release, and the operation of the bolt carrier group. Make any necessary adjustments to ensure proper function.
Conclusion
Building an AR-15 lower receiver is a satisfying project that allows you to customize your rifle to your preferences. By following these steps, you can assemble a high-quality lower receiver that will serve you well for years to come. Remember to follow all safety guidelines and local laws when building and using your AR-15 rifle.
