80 AR Lower: A Comprehensive Guide

Are you looking to dive into the world of custom firearms? The 80 AR Lower is a popular choice among enthusiasts for its versatility and ease of use. In this detailed guide, we’ll explore the various aspects of the 80 AR Lower, from its history to its components and customization options.

History of the 80 AR Lower

The 80 AR Lower was introduced in the early 2000s as a response to the demand for a more affordable and customizable firearm. It is based on the AR-15 platform, which has been widely used in the United States for decades. The 80 AR Lower is named after the 80% rule, which allows for the purchase of a lower receiver that is 80% complete, requiring only a few additional parts to be classified as a firearm.

Components of the 80 AR Lower

The 80 AR Lower is composed of several key components:

Component Description
Receiver The receiver is the main structural component of the firearm, housing the trigger group and magazine well.
Trigger Group The trigger group includes the trigger, hammer, and safety mechanisms.
Fire Control Group This group consists of the bolt carrier group, gas key, and firing pin.
Magazine Well The magazine well holds the firearm’s magazine.

Customization Options

One of the most appealing aspects of the 80 AR Lower is its customization potential. Here are some popular options:

  • Barrel Length: You can choose from various barrel lengths, such as 16″, 18″, and 20″, depending on your needs.
  • Caliber: The 80 AR Lower can be chambered in a variety of calibers, including .223 Remington, 5.56 NATO, and .308 Winchester.
  • Handguard: There are numerous handguard options available, including collapsible, fixed, and rail-mounted designs.
  • Stock: You can select from a wide range of stocks, including traditional, folding, and telescoping options.
  • Optics: The 80 AR Lower is compatible with a variety of optics, including red dots, scopes, and holographic sights.

Building Your 80 AR Lower

Building your own 80 AR Lower can be a rewarding experience. Here’s a step-by-step guide to help you get started:

  1. Choose Your Lower Receiver: Select an 80% lower receiver that meets the 80% rule requirements.
  2. Assemble the Trigger Group: Install the trigger, hammer, and safety mechanisms into the receiver.
  3. Install the Fire Control Group: Attach the bolt carrier group, gas key, and firing pin to the receiver.
  4. Attach the Magazine Well: Secure the magazine well to the receiver.
  5. Install the Barrel: Mount the barrel to the receiver, ensuring it is properly torqued.
  6. Attach the Handguard: Secure the handguard to the barrel, following the manufacturer’s instructions.
  7. Install the Stock: Mount the stock to the receiver, ensuring it is properly adjusted.
  8. Attach the Optics: Mount your chosen optic to the handguard or receiver, depending on the type of optic.
  9. Test Your Firearm: Conduct a thorough inspection and test-fire your firearm to ensure it is functioning correctly.

Regulations and Safety

It’s important to be aware of the regulations surrounding the 80 AR Lower. In the United States, the 80% rule allows for the purchase of a lower receiver that is 80% complete, but it must be finished by the owner to be classified as a firearm. This process typically involves