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CNA Adjustable Gas Block (0.75")

  • 6147


The Canadian National Arms (CNA) .75" Adjustable Gas Block is designed to fit under all light weight, free float rail systems from most manufacturers.  The gas block allows you to fine tune your rifle’s gas flow from fully open down to a near-complete shutoff.

Adjustments are made via a side-mounted set-screw (1.5mm hex key) and a rear-accessed slotted retaining screw locks the adjustment in place, no need for Locktite. Note you'll have to 

Machined from 4140 chromoly steel with rounded edges all over.  Easy installation, secured with two set screws. Retains the same height/profile as the standard CNA low-profile gas block.

Best part of this thing beside the value is that the adjustment screw is accessible from the side (unlike ergo et al) this means you can fine tune on the range with your hand guard in place with ease then take things apart for the final tighten up once at home.

  • Steel
  • Near-complete shutoff with zero adjustment drift
  • Chamfered edge
  • Fits under most free-float handguards
  • Same profile/height as the standard low-profile gas block
  • 4140 steel
  • 1" long x 0.984" wide
  • Weight: 52g

You get:

  • (1) Gas Block
  • (2) M4-0.7x5 set screws for a secure attachment to the barrel
  • (1) Gas tube roll pin

Compatible with:

  • Barrels with a 0.75" gas block mount diameter

Installation Difficulty: 

Tools requiredA punch to get the gas tube roll pin installed. Also you'll need an imperial 1/16 or 5/64” hex key to work the set screws when attaching to the barrel.

Installation notes: You need to watch that you don't cover the gas port and thus have the block rotated correctly. Just take your time.



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