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Questions & Answers
Is this front adjustable or side adjustable? Expert Answer

The Precision Reflex Adjustable Gas Block w/Straight Gas Tube has the adjustment screw on the side.

by Hunter, Gear Expert, June 24, 2022
Will it work on 308 ar10 build?

Fitment will depend on the gas block journal diameter of your AR-10 barrel. These will fit gas block journals with 0.875" or 0.936" diameters.

by Brandon, Verified Owner, March 31, 2021
2 Models Available
Gas Block Journal Size-Diameter
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Product Info for Precision Reflex Adjustable Gas Block w/Straight 15.165 in Gas Tube

The Adjustable gas block for barrel is constructed of 1141 high strength steel with a magnesium Phosphate finish. Gas block #10-32 adjustment set screw. Gas block held in place by 2 10-32 set screws. Gas block is 1.61in tall 1in in length and is .780in from bore center to gas tube. Block is 1.155 in width and comes with roll pin. Gas block will not fit under most hand guards because of the extra elevation to get adjustment screw between gas tube and barrel. The height from barrel center line and the gas tube is .78in. This set up works on AR15 rifle length gas systems and DPMS 308 gas system lengths. The dimension from bore center to the top of the gas block is .940in. From the back of the gas block to the gas port hole is .250. This leaves .035 between the back of the gas block and most steps in the barrel. This is for installing of the A2 style hand guards. So there should be a .035 gap between the barrel step and the gas block. This can be filled with spacer or leave empty. The overall Length of the straight gas tube is 15.165inimage

Specifications for Precision Reflex Adjustable Gas Block w/Straight 15.165 in Gas Tube:

Manufacturer: Precision Reflex
Color: Black
Fabric/Material: 1141 High Strength Steel
Gun Make: AR Platform
Condition: New

Package Contents:

  • Precision Reflex Adjustable Gas Block w/Straight 15.165 in Gas Tube

Precision Reflex Adjustable Gas Block w/Straight 15.165 in Gas Tube Orderable Models

List of Orderable Models

  • Precision Reflex .936 Adjustable Gas Block w/Straight 15.165 inch Gas Tube, Black, 05-936-02GT , MPN: 05-936-02GT , UPC: 90222553330 , Code: 3AK-RGB-GBGT936-05-936-02GT
  • Precision Reflex .875 Adjustable Gas Block w/Straight 15.165 inch Gas Tube, Black, 05-875-02GT , MPN: 05-875-02GT , UPC: 90222553293 , Code: 3AK-RGB-GBGT936-05-875-02GT
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Last updated 2026-09-10 UTC.