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How To

These are the How To Instructions for the Polymer80 jig and lower systems. 

Select the instructions based on the version of the product you own. Please note, that while the videos are very informative, you will need to download the PDF Instructions First, and read them. The videos do not contain the sizing info that is required to properly mill out the lower receiver. We urge you to use the videos as a secondary visual guide after reading the instructions.

G100 Version (legacy product)

G150 - Phoenix Version 1 and 2 Version

    308 WarrHogg Version (current version):
    PF940 V 1.0 80% Pistol Frame:

      • 80% Polymer Pistol Frame Instructions (PDF): Click Here
      • 9mm G17&22 Parts Diagram & Vendor List:     Click Here
      • PF940 Milling Instruction Video:                    Click Here                   

    BBS Rifle Kits and 80% Lower Receiver Builds:

    Tips, Tricks and Techniques

    How to Build AR15s: Several great links and articles are included below to get you started. Choose which article fits your learning style. These articles also can be utilized for the 308 WarrHogg rifle build as well.

    Key differences on our AR15 as you read through the articles: Note that when they discuss the Bolt Catch assembly in these articles, our system uses the stainless steal dowel pin and set screw rather than a roll pin that comes with most Lower Parts Kits. Just ignore thse sections that don't apply. Install the spring and mag catch buffer pin, but use our stainless pin to hold the mag catch in place, then hold the stainless dowel pin in place by screwing the small black set screw into place. You'll have to use a little bit of force to get the set screw going. 

    On the AR15 Lower and our 308 Lower, we also use a square nut and philips screw to install the pistol grip rather than the screw and washer provided in most Lower Parts Kits.

    ArticleLink             Article: How to assemble an AR15(Click Here)
    Brownells Videos: How to assemble an AR15
    (The most applicable sections are Upper and Lower Receiver
    installs, Handguard and Muzzle Break installation)
    (Click Here) Article: How to Build an AR15
    (Lots of detailed pictures in this one)
    (Click Here)

    Customer Recommended Articles

      • How to use Brownell's Alumihyde to give the lower receiver an aluminum look and feel and to remove the ejection pin marks on the receiver: Click Here