Brass Goat (BG15) Compatibility

Step 1

The first step to determine fit is to assess the type of lower receiver that you have. Brass Goat is compatible with a typical AR-15 mil-spec lower receiver, as shown here.  [Accessories and exceptions shown below]. 

This includes these AR-15 cartridges:

  • .17 Remington
  • .204 Ruger
  • .22 Nosler
  • 223 Remington
  • .224 Valkyrie
  • .35 Viper
  • .458 SOCOM
  • .50 Beowulf
  • 5.56mm 
  • 6.5 Grendel
  • 6.8 SPC
  • 7.62 X 39mm
  • 300 Blackout
  • 350 Legend
  • 450 Bushmaster

    Step 2

    The next set of criteria is to assess the type of accessories and setup you have. Brass Goat will work with the following compatible scenarios and won't work with the firearms or firearm accessories in the not compatible list.


      Not Compatible

        Right-handed ejection upper receiver X Left-handed ejection upper receiver
      Extended Mag release X Side charging upper receiver
      Magpul BAD lever X Extended takedown pins
      Suppressors  X AR-10/308
      X 6.5 Creedmor


        *22 Long-Rifle Exception
        There are variances in the dimensions of lower receivers for the 22LR, depending on the manufacturer. 

        Brass Goat now has a dedicated mount made to fit the Smith & Wesson MP 15-22. Select this mount in the 'Options' drop-down before purchasing.
        Contact us with other questions on 22LR fit.
          This is not a comprehensive list, if you have questions about compatibility you can contact us at