The DoubleStar DSC750 low profile gas block for AR-15 rifles is built for shooters who want the freedom to run a free-floating handguard without sacrificing barrel compatibility. Unlike standard gas blocks that sit proud of the barrel, this .750-diameter design lets your handguard extend over the gas port on HBAR contoured barrels—a practical advantage for precision builds where every tenth of an inch of rail real estate matters. Whether you're building a match rifle, a hunting platform, or an accuracy-focused setup, a low-profile gas block removes the guesswork and lets you maximize your handguard options.

DoubleStar machined this block from steel and finished it in Black Nitride for durability and corrosion resistance in the field or on the range. Installation is straightforward: two set screws secure the block to your barrel, and it uses a standard 5/64 x 5/16 gas tube roll pin—parts that won't leave you hunting for oddball hardware when you need to do field maintenance or swaps.

If you're upgrading an existing AR or starting a new build where free-floating accuracy and handguard flexibility are priorities, the DoubleStar low profile gas block removes a common compromise. It's the kind of detail that separates a rifle thrown together from one engineered to perform.

Key Features

• .750 diameter sized for HBAR contoured barrels
• Low profile design allows free-floating handguard to extend over gas port
• Steel construction with Black Nitride finish for durability
• Dual set screw attachment for secure, repeatable mounting
• Compatible with standard 5/64 x 5/16 gas tube roll pin

Specifications

Frequently Asked Questions

What barrels does this low profile gas block fit?

The DSC750 is sized for HBAR contoured barrels with a .750 diameter at the gas port. It's designed specifically to work with this profile and allow a free-floating handguard to extend over the gas port area.

Can I use this gas block with a free-floating handguard?

Yes—that's the core advantage of the low profile design. Because it sits lower than a standard gas block, your free-floating handguard can extend over the gas port without clearance issues, giving you more flexibility in rail coverage and handguard choice.

How is it secured to the barrel?

The DSC750 uses two set screws to clamp it securely in place. Installation requires a standard 5/64 x 5/16 gas tube roll pin, which is commonly available and easy to replace if needed.

What finish does it have?

The block is steel with a Black Nitride finish, which resists corrosion and wear in both range and field conditions.