PRIMO Gas Block .750" 416R crucible alloy

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The PRIMO Gas Block™ is a low profile billet machined, .750” ID block, made from nitrided 416R crucible alloy steel. The block has two provisions for mounting, set screws and / or pinning. The included splined pin allows qualified gunsmiths and experienced builders the option of having a military style secured gas block. A 1/8” carbide drill bit and three ton press are recommended for pinning. Knurl grip cup pointed fasteners ensure a secure attachment to host barrel. The PRIMO's pre-drilled hole helps locate the drilling operation on pre-dimpled barrels for fixture free installation.

  • 416R Crucible Alloy Steel
  • QPQ Nitride finish
  • .750" gas block diameter compatible
  • low profile design
  • included splined pin
  • Knurl grip - cup pointed fasteners
  • inlcuded hex key
  • Included gas tube roll pin
  • Pre-drilled for ease of barrel pin installation

Additional Details

Type Of Part:
Gas Block

1 Review

  • 5
    Fixed My Problem

    Published by Brandon on 8th May 2020

    I am what many would consider a poor, so while building my AR10 I used a PSA upper. The adjustable gas block didn't work and I had constant cycling issues. Griffin Armament being less than 30 miles away from my house had the best quality part and it fixed my problem. Very pleased to say that I no longer have issues with my rifle.

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