Building an Accurate AR15 Part 2: The Lower Receiver

Published on March 18, 2024
Duration: 51:15

This video details the assembly of an AR-15 lower receiver, emphasizing components that enhance accuracy and consistency. Key steps include installing a tensioning set screw for a tight upper-lower fit, a Geissele SSA-E trigger for a crisp pull, and a Law Tactical folding stock adapter. The build also incorporates ergonomic choices like the Die Free Co. Kung-Fu Grip and a B5 Systems stock for adjustability, culminating in precise optic mounting with a Vortex Venom scope via a Trijicon Q-LOC mount.

Quick Summary

A tensioning set screw on the AR-15 lower receiver eliminates upper-lower wobble for improved accuracy. A Geissele SSA-E trigger provides a crisp pull, while a Law Tactical adapter adds folding capability. Proper optic mounting with systems like Trijicon Q-LOC is crucial.

Chapters

  1. 00:00Introduction & Series Overview
  2. 00:35Lower Receiver Tensioning Screw Explained
  3. 02:30Lower Receiver Vice Block Setup
  4. 03:10Magazine Catch Installation
  5. 05:25Bolt Catch Installation (Screw Type)
  6. 07:40Pivot Pin & Trigger Guard Assembly
  7. 10:05Geissele SSA-E Trigger Installation
  8. 11:01Radian Talon Safety Selector Install
  9. 13:08Pistol Grip & Detent Installation
  10. 15:05Law Tactical Folding Stock Adapter Install
  11. 17:20Buffer System & B5 Stock Assembly
  12. 18:16Vortex Venom Optic Mounting (Trijicon Q-LOC)
  13. 21:08MDT Bipod Attachment
  14. 22:40Final Receiver Tension Adjustment

Frequently Asked Questions

What is the purpose of the tensioning set screw on the lower receiver?

The tensioning set screw on the lower receiver removes any play or wobble between the upper and lower receiver halves. This ensures a solid connection, which is crucial for maintaining consistency during the trigger pull and improving overall rifle accuracy.

Why is a Geissele SSA-E trigger recommended for an accurate AR-15 build?

The Geissele SSA-E (Super Semi-Automatic Enhanced) trigger is recommended because it offers a lighter, crisper pull than many standard triggers. This improved trigger feel allows for more precise control, reducing unintentional movement during the shot and contributing significantly to accuracy.

How does the Law Tactical Folding Stock Adapter affect the build?

The Law Tactical Folding Stock Adapter adds significant utility by allowing the AR-15's stock to fold, making the rifle more compact for storage and transport. Proper installation, including torquing the internal locking ring with the correct tool, is essential for its reliable function.

What are the key components for mounting an optic on this AR-15 build?

This build uses a Vortex Venom 3-15x44 FFP scope mounted with a Trijicon Q-LOC mount. This system ensures a secure and repeatable attachment, and the video demonstrates using a leveling system for precise optic alignment.

Related News

All News →

More Gunsmithing & DIY Videos You Might Like

More from Brownells, Inc.

View all →