Building an Accurate AR15 Part 2: The Lower Receiver

Published on March 18, 2024
Duration: 51:15

This guide details the advanced assembly of an AR-15 lower receiver, focusing on components that enhance accuracy and ergonomics. Instruction from Brownells' technical expert Caleb covers the installation of specialized parts like the Geissele SSA-E trigger, Radian Talon safety selector, and Law Tactical folding stock adapter. The process emphasizes precise component fitment, including using a tensioning screw to eliminate upper-lower receiver play for improved stability and trigger consistency.

Quick Summary

Building an accurate AR-15 lower receiver involves precise assembly and component selection. Key steps include installing a Geissele SSA-E trigger for a crisp break, using a tensioning screw to eliminate upper-lower receiver play, and properly leveling optics like the Vortex Venom with mounts like the Trijicon Q-LOC for consistent accuracy.

Chapters

  1. 00:00Introduction & Lower Receiver Focus
  2. 00:35Lower Receiver Tensioning Screw
  3. 02:30Vise Block & Magazine Catch Install
  4. 05:25Bolt Catch Installation
  5. 07:40Pivot Pin & Trigger Guard
  6. 10:05Geissele SSA-E Trigger Install
  7. 11:01Radian Talon Safety Selector
  8. 13:08Pistol Grip Selection
  9. 15:05Law Tactical Folding Adapter
  10. 17:20Buffer System & Stock
  11. 18:16Optic Mounting
  12. 21:08Bipod Attachment
  13. 22:40Final Tension Adjustment

Frequently Asked Questions

What is the purpose of the tensioning set screw on an AR-15 lower receiver?

The tensioning set screw on an AR-15 lower receiver is designed to eliminate any play or wobble between the upper and lower receiver halves. This precise fitment improves stability, leading to more consistent trigger pulls and enhanced overall shooting accuracy.

Which trigger is recommended for building an accurate AR-15, and why?

The Geissele SSA-E (Super Semi-Automatic Enhanced) trigger is recommended for its lighter pull weight and crisp break. These characteristics are crucial for shooters aiming to improve accuracy by minimizing disturbance to the sight picture during the trigger press.

How is an optic properly mounted for maximum stability on an AR-15 build?

For maximum stability, optics like the Vortex Venom are mounted using robust scope mounts such as the Trijicon Q-LOC. It's essential to ensure the optic is perfectly leveled, often using a specialized workstation like the Real Avid Master Gun Workstation, to maintain consistent point of impact.

What is the benefit of using a Law Tactical folding stock adapter?

The Law Tactical folding stock adapter allows the rifle's stock to fold, significantly reducing the overall length of the firearm. This feature is highly beneficial for storage, transportation, and maneuverability in confined spaces.

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