OT Firearms AR15 Low Profile Set Screw Gas Block - Black Nitride

$21.99 $16.95
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Old Testament Firearms Low Profile Set Screw Style Gas Blocks for the AR-15 or AR-10 (LR308) are machined with high quality steel and nitrided. The low profile gas block design allows you to mount it underneath any free float hand-guard slim or regular sized. It is not milled out so there is a solid uniform surface that will not collect dust and dirt. Standard barrel diameter is 0.750, but there are several other sizes that will work with other barrel diameters, find the right size for your custom barrel!

  • Works with either an AR-10 (LR308) or any AR-15 with appropriate diameter barrel.
  • Barrel diameter options include 0.625, 0.750, 0.875, and 0.936 Inch
  • Includes Roll Pins & Allen Wrenches
  • Set Screw Style
  • Set Screw Spacing: .410"
  • Can add on a Gas Tube of Your Choice (Pistol, Carbine, Mid-Length, or Rifle)


  • .625 Diameter = 1.4oz
  • .750 Diameter = 1.5oz
  • .875 Diameter = 1.6oz
  • .936 Diameter = 1.6oz