Installation Videos for AR-15 Parts

Tips and Tricks for AR-15 Parts and Accessories

Below are some great videos that show how to install various AR-15 parts and accessories


AR-15 Free Float Handguards

AR-15 Triggers

AR-15 Furniture Kit


How to Install the AT3 SPEAR M-LOK Handguard

This video explains how to install our SPEAR Free Float M-LOK Handguard - as well as some handy tips for completing an upper receiver build or upgrade.

Free Float Handguards are a great upgrade for any rifle, and can increase accuracy by reducing contact on the barrel.

How a Mil Spec AR-15 Trigger Works

Here's an overview of the function of the AR-15 Mil-Spec trigger - how the trigger works, the components of the trigger, and some ways to improve the function of your Mil-Spec AR trigger.

AR-15 triggers are critical portions of your rifle, as they control the firing of rounds and can have a big impact on your accuracy as a shooter.

We wanted to make a video that shows how an AR-15 trigger works, more specifically the whole fire control group.

Installing the Magpul MOE Furniture Kit

Learn how to install Magpul MOE Furniture Kit. This is an AT3-Exclusive full furniture kit in multiple styles This furniture set contains 3 easy-to-install components - MOE mil-spec buttstock, MOE pistol grip, and MOE carbine handguard.

Install Free Float Quad Rail

This first video shows the whole process - this is great for the "slim design" style rails like our 15.75" rail. This video is also great because it shows how to remove the sight tower and existing drop-in handguard

The second video shows how to install the "monolithic" style rails like our 7", 10", and 12" rails (skip ahead to :47)

Zeroing Iron Sights

Stock & Buffer Install

Trigger Install

Assembling an Upper Receiver

Assembling a Lower Receiver

 Another video on assembling a lower receiver

Cleaning Your AR-15