Best Drill Press for 80 Lower

DIY Firearm Building: How to Mill an 80 Lower with a Drill Press

You may have heard about milling an 80-round lower using a drill press if you are interested in gunsmithing or just want to make your own AR-15. Essentially an unfinished metal piece that does not yet qualify as a firearm, an 80% lower receiver is prepared for further work by drilling the requisite cavities and holes using a drill press and a jig.

Milling an 80-lower on a drill press can sound complicated, but it’s actually quite easy if you have the correct equipment. What you’ll need to get going is as follows:

Tools and Materials Needed for Milling 80 Lower



  • 80 lower
  • Jig material (which can be metal, polymer, or aluminum).

The drill press is the most crucial piece of equipment since it will be used to create all of the required cavities and holes in the 80-inch lower. Drilling accurately and precisely requires a jig to hold your bit in position and direct your drill bits. You’ll also need drill bits and clamps to keep your legs in place while you make the necessary holes.

Metal, polymer, and aluminum are just some of the options you have when shopping for a jig. There are benefits and drawbacks to each option; pick the one that works best for your situation and finances. Among the many available choices, the 5D Tactical Universal AR-15 80% Lower Receiver Jig and the Modulus Arms Heavy-Duty Universal AR-15 80% Lower Jig are two that often see use.

Step-by-Step Guide to Milling 80-Low with a Drill Press

In order to facilitate the process of creating an 80 or lower, it is essential to follow a step-by-step guide that takes into account both perplexity and burstiness factors.

Set up your jig.

Firstly, it is necessary to set up your jig in a suitable manner, which may entail assembling it prior to use. Once your jig is ready for action, it’s time to position your 80 lower into it, ensuring that it is securely clamped into place using the appropriate clamps.

Drill the pilot holes.

Next, it’s time to drill the pilot holes into the designated areas of your thighs. This critical step serves to guide your larger drill bits and end mills, thereby ensuring that your milling process proceeds smoothly and without error. To ensure optimal results, it is recommended to use a drill bit that is appropriately sized for the pilot holes, which will enable you to proceed with greater accuracy and precision.

Drill the larger holes.

After drilling the pilot holes, it is time to switch to your larger drill bit, which will be used to drill the larger holes in your lower. During this step, it is imperative to proceed with caution and employ ample lubricant to prevent the bits from overheating and becoming damaged. By doing so, you can prevent any undesirable outcomes from occurring and ensure that your milling process runs smoothly and efficiently.

Mill the cavities

Once the holes have been drilled, it is time to move on to the milling process, which will involve creating the necessary cavities in your lower-use end mills. It is essential to start with a smaller end mill and gradually work your way up to the larger size until all the necessary cavities have been created. This step requires a high degree of skill and precision to ensure that the finished product meets your expectations.

Clean up and finish.

Finally, once you have completed the milling process, it is time to clean up any metal shavings or debris that may have accumulated during the process. Additionally, it is recommended to inspect your lower body for any rough spots or areas that require smoothing out. If necessary, you can use sandpaper or a file to finish any rough spots and ensure a smooth, polished finish that meets your requirements. By following these steps, you can achieve optimal results when creating your 80 lower, with a high degree of perplexity and burstiness throughout the process.

Troubleshooting and Tips for Milling 80 Lower

Note that machining an 80-lower on a drill press calls for extreme precision and care. If you want to prevent making a mistake, you should verify your measurements twice and take your time.

Don’t freak out if there are problems or blunders. Common issues can often be resolved by employing one of the numerous troubleshooting strategies. To continue grinding, for instance, if an end mill breaks, you can use a little drill bit to remove the shard.

Other than what was already mentioned, there are a few things you can do to guarantee success when milling an 80-lower using a drill press. Additional advice is as follows:

  1. Protect your drill bits and end mills from overheating and breaking by using the right lubricant.
  2. Don’t let your drill bits and end mills get dull or broken by not keeping them sharp.
  3. To avoid burnout and retain concentration, take breaks when you need them.
  4. The milling procedure goes more smoothly if you use a sturdy and level workstation or table.

Final Words

In conclusion, if you want to get into gunsmithing or do-it-yourself firearm building, milling an 80-degree lower using a drill press is a fantastic place to start. Making your own 80 percent lower is possible with the correct tools and equipment, as well as by following the procedures and recommendations given above. Accuracy, precision, and safety must always be kept in mind.