FAQ – Questions & AnswersCategory: Lower Receiver FAQHow to build a lower receiver?
Shiloh asked 2 years ago
What parts make up a lower receiver?

4 Answers
Antony answered 2 years ago
Building a lower receiver from scratch is a relatively complicated process, and it’s important to be aware of the laws and regulations governing firearms in your area before getting started. That being said, there are a few basic steps you can follow to get started:
1. Choose the right materials. The most important part of building a lower receiver is using the correct type of metal. Most receivers are made from either aluminum or steel, but it’s important to check with your local authorities to make sure you’re using the correct type for your area.
2. Create the template. The next step is creating a template for the receiver. This can be done by drawing out the desired shape on paper or cardboard and then cutting it out with a sharp knife.
3. Cut out the receiver. Once you have your template, use a saw to cut out the shape of the receiver from the metal. Make sure to use a steady hand and follow the lines of the template as closely as possible.
4. Drill the holes. Next, you’ll need to drill any holes that are required for the receiver. This will vary depending on the design you’re using, but common locations include the trigger hole and the magazine release hole.
5. Finish the edges. Finally, use a file or sandpaper to smooth out any rough edges on the receiver. Once you’re finished, you should have a completed lower receiver that’s ready for use.

Cruz answered 2 years ago
There are a few ways to build a lower receiver. You can buy a lower receiver kit, or you can mill your own lower receiver from a block of aluminum.
To mill your own lower receiver, you’ll need a machine lathe and some basic machining tools. The process is relatively simple: first, you’ll need to drill the holes for the trigger and hammer pins, then machine the Magazine Well and rear takedown lug and finally cut the relieved areas on the sides of the Receiver.
If you’re not comfortable machining your receiver, there are plenty of kits available online that will walk you through the entire process step-by-step. Building your own lower receiver is a great way to learn about the inner workings of your firearm, and it can also save you money in the long run.
You can find the best stripped lower receiver here.

Jordan answered 2 years ago
Building a lower receiver is not a task for the beginner. It requires specialized knowledge and tools and can be dangerous if done incorrectly. That being said, there are plenty of guides out there that can walk you through the process step by step.
The first step is to purchase an unfinished lower receiver from a firearms dealer or online retailer. You’ll also need a jig – which is essentially a template that helps you drill the correct holes in the receiver – as well as drill bits, saws, punches, and other tools needed to complete the build.
Next, you’ll need to attach the jig to the receiver using clamps or screws. Then use the drill bits specified in your guide to creating pilot holes for the trigger and hammer pins, as well as the selector switch. Once those are all drilled, you can begin milling out the fire control group cavity using an end mill or router.
Once the FCG cavity is milled out, you can move on to installing the trigger assembly. This involves placing the trigger in the receiver, then installing the trigger and hammer pins. The next step is to install the selector switch, followed by the grips.
After the grips are installed, you can move on to installing the magazine release and bolt catch. These usually just require a few screws to be tightened down.
The last step is to install the buffer tube assembly and stock, and your lower receiver is complete!

Lewis answered 2 years ago
Building a lower receiver is a relatively simple process, but it’s important to follow all the proper safety precautions.
Here are the basic steps:
1. Purchase a lower receiver flat jig and drill fixture from a gunsmithing supply store. This will help you keep the chassis straight while you’re drilling.
2. Drill the trigger and hammer pin holes using a 1/4″ bit. Make sure that the holes are perpendicular to the flat surface of the receiver.
3. Use a 7/16″ bit to drill out the magazine well opening. Be careful not to drill too deep or you’ll damage the threads that hold the magazine in place.
4. Mark and drill out the takedown lug hole using a 3/8″ bit. This hole needs to be drilled at an angle, so take your time and make sure it’s straight.
5. Cut out the rear receiver tang using a hacksaw or Dremel tool. Be careful not to damage the adjacent surfaces.
6. Use a file or Dremel tool to smooth out the edges of the tang cutout. You don’t want any sharp edges that could snag on clothing or skin.
7. Drill out the trigger guard screw holes using a 1/8″ bit. These holes need to be drilled at an angle, so take your time and make sure they’re straight.
8. Install the trigger guard into the receiver using the screws. Make sure that the trigger guard is level and flush with the receiver surface.
9. Use a file or Dremel tool to smooth out the edges of the trigger guard screw holes. You don’t want any sharp edges that could snag on clothing or skin.
10. That’s it! Your lower receiver is now complete.
If you have any questions about the process, feel free to ask in the comments below. And be sure to check out our other FAQs for more information on building AR-15s. Thanks for reading!