BRT Micro Pin Gas Block – .750″

Original price was: $59.95.Current price is: $46.47.

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SKU: GB-1-750

Product Description

The MicroPin Gas Block is designed to fit under most available free float rails and fits all AR Family barrels with a .750″ nominal diameter gas block journal. All bores are machined to very tight Mil-Spec tolerances to ensure precise fits on both the barrel journal and gas tube. This maximizes gas flow and allows top gas system performance. Pinning of the gas block is a must for professional end users who demand the ultimate reliability from their carbines. In fact, the Mil-spec requires pinning on Front Site Bases. Most low-profile gas blocks are designed to be secured with just two small set screws. Unfortunately, those gas blocks can come loose from the heat and impact of heavy firing schedules and rough handling. The Black River Tactical Pinnable Gas Block is designed to be easily pinned to the barrel in addition to set screw mounting, for a maintenance-free, reliable solution. It features a flat, center spotted face that allows for easy drilling and installation of the coil pin. To install, secure the assembled barrel and gas block in a drill press vice and drill through, using the center spot as a guide. The stainless steel coil pin is then easily driven in, resulting in a permanent solid lock up. The block may also be used with solid dowel pins and taper pins. We offer our Pinning Kit separately for those who wish to install a solid dowel pin.


  • Material: Precision CNC machined from 4140 Chrome-Moly steel
  • Through hardened for maximum strength and toughness.
  • Finish: in Mil-spec Black Oxide
  • Measures 0.925” in length
  • Weight:y 1.33 oz.
  • Fits barrels with a .750″ nominal diameter gas block journal
  • Made in the USA


  • Gas Block
  • (2) knurled set screws
  • Installation Instructions


Technical Information

Color / Pattern

Gas Block Size



4140 Steel


Black Oxide

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit