Home AR-15 Building an Accurate AR15 Part 2: The Lower Receiver

Building an Accurate AR15 Part 2: The Lower Receiver

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In this video, Caleb covers the second installment of the “How to Build an Accurate AR Series.” The video meticulously details the selection and assembly of components for building an accurate AR-15, including:

-Choosing a lower receiver with a tension screw to remove any play between the upper and lower receiver.
-Full detailed installation of the lower receiver components
-Why Loose Fitting Components Are an Issue
-LAW Folder Installation
-How Using a BCM RMS Will Help With This Build
-Stock Selection and Installation
-Bipod Installation
-How to properly mount an optic, full video here-
-Properly Adjusting the Tension Screw

Upper Receiver Part 1:

Chapters
0:00 Intro
0:50 Notes on Loose Parts
2:35 Lower Receiver Parts Installation
19:35 LAW Folder & Buffer Tube Installation
27:28 BCM RMS
28:15 B5 Stock
30:00 Upper Install & Optic Mounting
45:15 Bipod Installation
47:20 Adjusting the Lower Tension Screw
50:20 Close

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25 COMMENTS

  1. I must apologies that this one is a bit longer than it really needs to be, but I wanted these videos to be a one stop shop for a new/novice builder as well so I run through the basics pretty thoroughly. Feel free to skip around if needed! Oh, and for a detailed optic mounting video, check out-

  2. I used a front pivot pin too for every build I've done. That trick you had is either black magic or years of experience. I normally launch at least one detent pin on every build. I don't know how you do it, but I'm going to give it a shot.

  3. Before installing the trigger guard pivot roll pin, I recommend putting a little anti-seize grease on it. I like your idea of greasing the safety detent and spring before installing them. Also, your technique for installing the forward lower receiver pivot take-down pin is clever.

  4. For some reason I feel like I’m home every time I watch a Brownells video.
    Like Caleb is my rich cousin from my mom’s side that lives out of state.
    Even though I don’t see him often, it’s always nice to catch up on video.

  5. I keep turning it up to hear your instructions, but the intro music keeps playing through the whole video. I think it should maybe fade out after 15 or 30 seconds? Love the videos.

  6. The "problem" with AR-15s is that by the time you get all the upgrades you want, you have enough "spare parts" that you can build a second one for just the cost of a stripped lower!

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