Building your own AR-15 can be an exciting and rewarding experience. It allows you to customize your rifle to your specific needs and preferences. One of the first steps in building your AR-15 is to finish the lower receiver. In this article, we will guide you through the process of finishing an 80% AR-15 lower receiver.
What is an 80% AR-15 Lower Receiver?
An 80% lower receiver is an unfinished lower receiver that requires the user to complete the remaining 20% of the machining process. This is because the ATF considers an unfinished lower receiver to be a paperweight, and not a firearm. Once completed, the 80% lower receiver becomes a functioning firearm.
Tools and Materials Required
Before you start the process of finishing your 80% lower receiver, you will need a few tools and materials. Here is a list of the essential tools:
- Drill press or milling machine
- End mill bit
- Drill bits
- Vise
- Cutting oil
- Safety glasses and gloves
Step-by-Step Guide to Finishing an 80% AR-15 Lower Receiver
Now, let's get started with the step-by-step guide to finishing an 80% AR-15 lower receiver:
Step 1: Safety First
Make sure you are wearing safety glasses and gloves before you start the process. Cutting oil can be messy, so make sure you are wearing old clothes or a work apron.
Step 2: Secure the Lower Receiver
Secure the 80% lower receiver in a vise or a jig. Make sure it is clamped securely and cannot move around during the machining process.
Step 3: Drill the Trigger and Hammer Pin Holes
Use a drill press or milling machine to drill the trigger and hammer pin holes to the correct depth and diameter. Make sure to use cutting oil to keep the drill bit cool and lubricated.
Step 4: Mill the Fire Control Pocket
Use an end mill bit to mill the fire control pocket to the correct depth and dimensions. Make sure to use cutting oil and take your time to ensure a precise cut.
Step 5: Drill the Safety Selector Hole
Use a drill press or milling machine to drill the safety selector hole to the correct depth and diameter. Make sure to use cutting oil and take your time to ensure a precise cut.
Step 6: Clean and Inspect
Once you have completed the machining process, clean the lower receiver with solvent and inspect it for any burrs or rough spots that need to be smoothed out.
Step 7: Install Lower Parts Kit
Once the lower receiver is completed and inspected, you can install the lower parts kit, which includes the trigger, hammer, safety selector, and other components. Follow the manufacturer's instructions to install the parts correctly.
Conclusion
Finishing an 80% AR-15 lower receiver requires some specialized tools and knowledge of the machining process. However, with the right tools and a little bit of patience, anyone can complete this process and build their own custom AR-15. Always remember to put safety first and take your time to ensure a precise and accurate cut. Happy building!