Expo Arms Low Profile AR-15 Gas Block – Nitride – Set Screw – .750"

Expo Arms Low Profile AR-15 Gas Block – Nitride – Set Screw – .750"

The Expo Arms Low Profile .750 Gas Block provides a compact, secure gas-system mounting solution for compatible AR-15 and AR-308 barrels. Precision machined from 4140 chrome moly steel and finished in corrosion-resistant salt bath nitride, it is built for reliable performance beneath most free float handguards.

Low Profile Design for Free Float Handguards

This non-adjustable gas block uses a streamlined profile intended to fit beneath nearly any compatible free floated handguard. Its compact dimensions help keep the gas system protected while supporting a clean, modern AR build.

Precision-Machined 4140 Steel Construction

Constructed from 4140 chrome moly steel, the Expo Arms gas block is precision machined for consistent fit on barrels with a .750-inch gas journal. The salt bath nitride finish provides enhanced corrosion resistance and a durable black appearance that pairs well with nitride-finished barrels and bolt carrier groups.

Secure Dual Set Screw Mounting

Dual set screws provide a straightforward, low-profile installation method for compatible barrels. Proper installation and alignment help maintain secure gas-block positioning and consistent gas-system function.

Key Features

• Low-profile, non-adjustable AR gas block
• Fits barrels with a .750-inch gas seat diameter
• Precision-machined 4140 chrome moly steel construction
• Salt bath nitride finish for corrosion resistance
• Dual set screw mounting design
• Designed to fit beneath most compatible free float handguards
• Made in the U.S.A.
• Backed by Expo Arms' Limited Lifetime Warranty against manufacturer defects in materials and workmanship

Specifications

• Brand: Expo Arms
• SKU / MPN: XP-GB-750N
• Platform: AR-15 / AR-308
• Type: Set screw gas block
• Adjustment: Non-adjustable
• Gas Seat Diameter: .750 in
• Material: 4140 chrome moly steel
• Finish: Salt bath nitride
• Mounting Method: Dual set screws
• Weight: 1.2 oz.
• Country of Origin: Made in the U.S.A.

Compatibility

• Compatible with AR-15 and AR-308 barrels using a .750-inch gas journal.
• Designed for use with compatible free float handguards.
• Works with properly matched gas tubes and gas-system lengths.

Not Compatible

• Not compatible with barrels using .625-inch, .875-inch, or other non-.750-inch gas journal diameters.
• Not intended for users who need an adjustable gas block.
• Not guaranteed to fit handguards with insufficient internal clearance; verify handguard inside diameter before installation.

Important Notes

• This gas block does not include a gas tube roll pin.
• Confirm your barrel gas journal diameter is .750 inch before ordering.
• Proper gas-port alignment and set-screw installation are essential for reliable rifle function.
• Professional installation is recommended if you are unfamiliar with AR gas-system assembly.

Compact, Durable Gas-System Support

For builders who want a durable, non-adjustable .750 gas block with free float handguard clearance, the Expo Arms Nitride Low Profile Gas Block delivers a practical combination of steel construction, corrosion resistance, and secure dual set-screw mounting.

Frequently Asked Questions

What barrel size does this gas block fit?

This gas block fits barrels with a .750-inch gas journal, also called a gas seat diameter.

Is this an adjustable gas block?

No. This is a non-adjustable gas block designed for fixed gas regulation.

Will this fit under a free float handguard?

Its low-profile design is intended to fit beneath most compatible free float handguards. Confirm your handguard's internal diameter before installation.

Does this gas block include a gas tube roll pin?

No. A gas tube roll pin is not included with this version.

How is this gas block secured to the barrel?

It uses a dual set screw mounting design. Proper alignment and installation are important for secure retention and gas-system reliability.

Will this work with an AR-15?

Yes, provided your AR-15 barrel has a .750-inch gas journal and uses compatible gas-system components.

Can this be used on an AR-308?

Yes, it can be used on compatible AR-308 barrels with a .750-inch gas journal. Verify barrel, gas tube, and handguard dimensions before installation.

What finish does this gas block use?

It features a salt bath nitride finish that provides corrosion resistance and a durable black appearance.