Lantac Ultra Low Profile Gas Block - .750 - Set Screw

Manufactured by Lantac USA
SKU: LA00243
MPN: LA00243
Manufactured by Lantac USA
1 Review

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The GB750-S is designed to fit .750” gas seat diameter barrels and utilizes two set screws to secure the block in place. Gas port hole placed correctly at .295” from the shoulder. Includes (2) #10-32 X .125'' set screws and gas tube roll pin.

  • 4140 gun barrel steel
  • Black phosphate finish
  • Laser engraved
  • Ultra-low profile
  • Gas seat diameter: .750''
  • Length: 0.875''
  • Weight: 1.2 oz
  • Made in the U.S.A.

LANTAC USA manufactures the highest quality accessories for AR-15/M16 pattern rifles. Precision made in the U.S.A., rifles, muzzle brakes and more.
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BrandLantac USA
FinishManganese Phosphate
MaterialSteel - 4140 Chrome Moly
Size.750 in
TypeLow Profile

WARNING: This Product can expose you to chemicals which is known to state of california to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

1 review

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Lowest Profile Gas Block I Could Find


After my latest build I found my Aero Gas Block a little to tall and I could get mlok nuts under the has block with out grinding down the mlok nuts & screws. So I decided to swap out the gas block with a lower profile GB and thats when I came across the Lantac Ultra Low Profile Gas Block. Very nice Nitride finish with laser engraving. The GB was machined perfectly and the gas hole was in proper location. This GB the gas tube actually sticks out through the front of the GB meaning you see the tube go in one side and out the other about 1/8". The 2 set screw they provide probably have the biggest knurling I've seen on set screws which dug into my Ballistic Advantage with no problems and gas tube roll pin wasn't too bad of a install. Matched this GB with a Spikes Tactical Melonite gas tube and it looks awesome and I shaved about a 1/16" in overall ht off the GB and about 1/8" off the front to back in width. Also gas me enough space to get the mlok accessories attached.