The Ultimate Firearms Magazine for the Gun Lifestyle



Lower Receiver Overhaul


When handling firearms, always observe safety rules and the precautions set forth in the firearm's owner's guide. Be certain that your firearm is unloaded and made safe before proceeding with this DIY.








AR-15 Lower Receiver Overhaul

The AR-15 is one of the most customizable rifles on the market.

With multiple alternatives available for virtually every one of its components, its modification possibilities are nearly endless. However you decide to change up your AR-15, knowing how to actually affect these changes will free you up to personalize it to your heart's content. Although work on firearms is commonly recommended or required to be done by trained armorers or gunsmiths, these mods on an AR-15 lower receiver are easy do-it-yourself (DIY) projects, as long as you are careful and pay attention to the details. If you are in doubt at any point during this DIY, stop and consult a professional.


That being said, if you are up for the challenge and capable of working with your hands, read on and let's get this overhaul party started.



We begin with an Aero Precision lower receiver (P/N 953-000-001) with a Double Star Lower Parts Kit (P/N 100-010-669) and DPMS AR-15 A2 Butt Stock Assembly (P/N 231-115-004) already installed.



We'll tackle the modifications in the following sections:

 I. Trigger and Hammer Assembly, II. Grip and Abidextrous Safaty, III. A2 Butt Stock to collapsible Butt Stock & Extended Takedown Pins, IV. Trigger Guard


In order to do all of the listed work, you will need the following tools.

Having the right tool for the right job makes all the difference.

  1. 1. Brownells® Lower Receiver Vise Block
  2. 2. Brownells® Bench Block
  3. 3. Brownells® CAR-15/M4 Butt Stock Wrench
  4. 4. Brownells® Pivot Pin Installation Tool
  5. 5. Brownells® #3 (3/32) Starter Roll Pin Punch
  6. 6. Brownells® #4 (1/8) Starter Roll Pin Punch
  7. 7. Vise
  8. 8. Large Flathead Screwdriver
  9. 9. Hammer
  10. 10. Curved Pick or Similar Apparatus

I. Trigger and Hammer Assembly

II . Grip and Ambidextrous Safety

III. A2 Butt stock to Collapsible Butt stock & Extended Takedown Pins

IV . Trigger Guard

AR-15 Lower Receiver Overhaul

If you've never worked on your AR-15 yourself, you might want to try it out. It's fun and rewarding, and it can save you a few bucks. Remember to always be careful. When in doubt, double- and triplecheck your work before proceeding to the next step. Share your results with us on our Facebook page,; we always like to see before and after pictures of lower receiver overhauls.


Brownell's pricing at current time: $511.20