CMC Low Profile Gas Block – .750
$38.95
Elevate your AR-15 or AR-10 build with the CMC Low Profile Gas Block .750. Precision-machined from steel with tight tolerance control and a black phosphate finish, this gas block ensures durability and reliability. Compatible with most handguards and featuring locking screws for easy installation, it’s the ideal choice for firearm enthusiasts seeking a quality upgrade.
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Description
CMC AR Rifle Low Profile Gas Block
The CMC Low Profile gas block .750 is a great choice for your AR-15 or AR-10 build. This gas block works with most handguards and is designed to fit barrels with a gas seat area diameter of .750. Its precision machined from steel for a tight tolerance control and has a black phosphate finish. Plus, it comes with locking screws for an easy installation. Made in the USA, this low profile gas block is a great way to upgrade your firearm.
CMC Gas Block .750
- Made in USA Low Profile Gas Block for AR15
- Fits 0.75″ Regular Barrel and Standard Gas Tube
- Precision Machined from Steel with Tight Tolerance Control
- Black Phosphate Finish
- Includes Locking Screws
- SKU: CMC81611
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: www.P65Warnings.ca.gov
Low profile gas blocks replace the standard front sight base on AR-15 and AR-10 rifles, sitting below the top rail so a free-float handguard can pass over them unobstructed. The CMC low profile gas block uses a set-screw or pinned design to secure to the barrel, aligning the gas port on the block with the port on the barrel to ensure reliable cycling. The .750 designation refers to the barrel diameter at the gas block seat — the most common diameter found on mil-spec AR-15 barrels, government-profile barrels, and a wide range of aftermarket AR-15 and AR-10 barrels. Measuring the barrel journal before ordering is essential, as barrel diameters vary and using an incorrectly sized gas block will prevent proper installation. Low profile gas blocks are required on any rifle using a free-float handguard that extends past the gas port, since standard front sight bases are too tall to fit inside most free-float tubes. Installation requires removing the existing front sight base or delta ring assembly and properly aligning the new block to the barrel’s gas port before securing with the provided set screws. For AR builders upgrading to a free-float handguard or replacing a damaged front sight base, a CMC low profile gas block provides a clean, low-mass solution that clears any standard free-float rail system without adding unnecessary height above the bore.
Additional information
| Weight | .5 lbs |
|---|---|
| Brand | |
| Gas Block Diameter |
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Frequently Asked Questions
What barrel diameter does the .750 gas block fit?
The .750 designation refers to the inner diameter of the gas block — it is designed to fit barrels with a .750-inch outside diameter at the gas block seat. This is the most common diameter on mil-spec and government-profile AR-15 barrels. Measure your barrel’s journal before ordering to confirm compatibility.
Why use a low profile gas block?
Low profile gas blocks sit below the top rail, allowing a free-float handguard to pass over them without interference. They are required on any build using a free-float tube or rail that extends past the gas port, replacing a standard front sight base that would be too tall to fit inside the handguard.
How is the CMC low profile gas block secured to the barrel?
The CMC low profile gas block uses set screws to clamp onto the barrel journal. The gas port on the block must be aligned with the barrel’s gas port before tightening. Some builders also use thread-locking compound on the set screws to prevent loosening under recoil.
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