AR-15 Podcast - Builders Series- Assembling the Upper Receiver

Welcome to another episode of the AR-15 Podcast. On this episode, by popular request, we continue our newest builders series. This week we focus on assembling the Upper Receiver.

Show your support for the show by becoming a PATREON supporter. One hundred percent of your donations are invested in the show—never in our pockets. Help us bring you content and production value on the podcast about your favorite black rifle.


Assembling the Upper Receiver

  • Considerations
    • Materials
      • Grades of Aluminum
      • Coatings
    • Construction
      • Forged
      • Billet
    • Form
      • A1
      • A2
      • A3 (flat top)
  • Preparing the upper
    • Inspecting
    • Cleaning
    • Honing
      • Brownells - AR-15/M16 Upper Receiver Lapping Tool
  • Installing the upper receiver components
    • Is there an order
    • Protecting the lower
    • Interesting solutions and shortcuts 
  • Installing the Barrel
    • Anti-seize 
    • Loctite
    • Torque Specifications
      • Minimum Torque: 35 ft/lbs
      • C = (D(A+B))/A (A=length of wrench from center of handle to center of drive; B=length from center of drive to center of extension; C=wrench setting; D=desired torque applied to fastener)
    • Alignment (indexing pin/and cutout)
    • Alignment of the barrel nut.
    •  Brownells - Barrel Nut Alignment Gauge
  • Gas Block/Gas Tube
    • Aligning the Gas Block
    • How to secure the Block
    • Drifting in the Roll Pins
  • Handguards
    • Barrel Nut
    • Material
    • Features
    • Accessory attachment points 
  • Bolt Carrier Group   
    • Proper Gas Key installation
    • Materials
    • Coating
    • Low mass/proprietary
  • Muzzle Device
    • Washer
    • Indexing


·         Send us any questions or comments to

·         Subscribe and listen to the AR-15 Podcast for free in iTunes or on Stitcher and leave us a review so the show can place higher in the searches for potential listeners

·         Share your pics with us on Instagram at @ar15podcast and tag your pictures with #ar15podcast

·         Follow us on Facebook

·         Check out the other great podcasts on the Firearms Radio Network

·         Don’t forget to use our Brownells Affiliate link for all your AR-15 parts

·         And use the Amazon affiliate links on the and websites or goto