How to Disassemble an AR-15 Upper – Step-by-Step Breakdown

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Lets look at how to disassemble an AR-15 upper! Breaking down your AR-15 upper doesn’t have to be a pain. Whether you’re doing a deep clean, prepping for upgrades, or just curious how it all fits together—this teardown guide walks through every part, tool, and trick to get it done right. 

TL;DR

• Fully teardown your AR-15 upper receiver without damaging parts

• Includes barrel, front sight base, carry handle, ejection port cover, and forward assist

• Clear timestamps from the video walk you through each step

• Ideal for cleaning, inspection, upgrades, or Cerakote prep

• Complements the AR-15 Upper Assembly Guide

Why Disassemble an AR-15 Upper?

Breaking down the upper receiver lets you deep clean, inspect parts for damage, and prepare for upgrades. If you’re changing barrels, doing a paint job, or replacing a forward assist, this is where it starts.

What Tools Do You Need to Disassemble an AR-15 Upper?

• Bench vise with upper receiver block

• AR-15 armorer’s wrench

• Cup tip and roll pin punches (1/16″, 3/32″, 5/64″)

• Snap ring pliers

• Pick tool

Optional:

• Real Avid Armorer’s Master Kit (covers most of the above)

How Do You Take Apart an AR-15 Upper Receiver?

Step 1 – Remove the Handguards

Video Timestamp: 0:02

• If using drop-in clamshell handguards, pull back the delta ring and pop out each half.

• Free-float handguards vary by design—some require hex keys or barrel nut removal.

Step 2 – Separate the Upper from the Lower

Video Timestamp: 0:55

• Push the front and rear takedown pins from left to right.

• Pull the upper receiver off the lower and set aside the lower.

Step 3 – Remove the Carry Handle (if equipped)

Video Timestamp: 1:47

• Loosen the two thumb nuts on the side.

• Lift the carry handle off the upper.

Step 4 – Remove the Front Sight Base and Gas Tube

Video Timestamps: 2:14–4:14

• Use a cup tip punch to drive out the two taper pins (left to right).

• Use a 5/64″ punch to remove the gas tube roll pin.

• Pull the FSB off the barrel, then remove the gas tube.

Step 5 – Remove the Handguard Cap

Video Timestamp: 4:31

• Slide the cap off the barrel.

Step 6 – Remove the Barrel and Barrel Nut Assembly

Video Timestamps: 4:43–5:45

• Mount the upper in a vise using a receiver block.

• Use an armorer’s wrench to remove the barrel nut.

• Pull the barrel forward out of the upper.

Step 7 – Disassemble the Barrel Nut Assembly

Video Timestamps: 6:00–6:36

• Use snap ring pliers to remove the retaining ring.

• Pull off the spring and slip ring.

Step 8 – Remove the Ejection Port Cover

Video Timestamps: 6:47–7:25

• Push the retaining pin forward while holding tension on the spring.

• Remove the cover and spring from the receiver.

Step 9 – Remove the Forward Assist Assembly

Video Timestamps: 7:33–8:20

• Use a 3/32″ roll pin punch to drive out the pin.

• Gently ease out the forward assist and spring.

Step 10 – Disassemble the Forward Assist (Optional)

Video Timestamps: 8:25–9:40

• Use a 1/16″ punch to drive out the pawl pin.

• Remove the pawl, detent, and spring using a pick tool.

What Should You Check During Disassembly?

• Carbon or fouling around the barrel extension

• Roll pins, detents, and springs for wear or damage

• Gas tube for blockage or corrosion

• Ejection port cover spring alignment

• Cracks in the forward assist or its bore

How to Prep for Cleaning or Reassembly

• Lay parts out on a labeled mat or tray

• Keep pins and springs grouped

• Use cleaning brushes and solvent to scrub carbon

• Snap reference photos during disassembly if needed

• Lightly oil moving parts before reinstalling

Wrap-Up

Disassembling an AR-15 upper might look intimidating, but with the right tools and a clear walkthrough, it’s a straightforward job. Whether you’re chasing cleaner cycles, planning a new build, or just getting to know your rifle inside and out—this teardown gives you the confidence to make every shot count.

Don’t forget to check out the AR-15 Upper Assembly Guide to put it all back together right.

The Real Avid Armorer’s Master Kit, came out way after I filmed this video. That is my go to kit when working on AR’s these days

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Credit: Jason Schaller
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About the Author: Jason Schaller is a former FFL holder and founder of Eagle Eye Shooters Supply in Helena, MT, where he provided professional gunsmithing services and guided customers on all aspects of firearms ownership. Today, he teaches DIY gunsmithing at The Rogue Banshee and serves as a Chief Instructor at Freedom Crew University. With over a decade of hands-on professional experience with firearms and nearly 30 years in IT, Jason also holds top cybersecurity certifications including CISSP, CISA, and CRISC. When he’s not geeking out, he’s helping others build self-reliance, critical thinking, and firearms proficiency through real-world content.

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