Aero Precision Low Profile Gas Block Set Screw AR-15, LR-308 Nitride

The Aero Precision Nitride Low Profile Gas Block Set Screw is a precision-engineered replacement or spare fastener designed for AR-15 and LR-308 platform builders working with Aero's low-profile gas blocks. If you're assembling or maintaining a custom rifle and need a direct replacement set screw or a backup component, this hardened steel fastener delivers the durability and secure fit you expect from Aero's American-made parts lineup. The nitride finish resists corrosion and handles repeated cycling without compromising the gas block's indexing.

This set screw threads into the gas block to lock it firmly in place on your barrel. It's manufactured from 4150 hardened steel with a knurled cup point design—the knurling gives you grip during installation, while the cup point seats cleanly against the barrel's OD for consistent, repeatable clamping. The fastener is sized to work with barrels measuring .625, .750, .825, or .936 inches in outer diameter, covering most common AR and LR-308 builds. Aero's low-profile design keeps the gas block compact and out of the way, especially valuable if you're running handguards or other rail systems tight to the barrel.

Installation is straightforward: thread the set screw into the tapped hole on your gas block and tighten to a snug fit against the barrel. Aero recommends against using red thread locker on the screw threads; if you prefer to use thread locker for added security, opt for a non-permanent formula. The set screw ships without a roll pin, so verify whether your gas block requires one separately before assembly.

Key Features

• 4150 hardened steel construction with nitride finish for corrosion resistance
• Knurled cup point design for secure seating and non-slip grip during installation
• Compatible with .625, .750, .825, and .936 OD barrels
• Low-profile geometry integrates seamlessly with modern rail systems and handguards
• Made in the USA
• Works with AR-15 and LR-308 platforms

Specifications

Frequently Asked Questions

Will this set screw fit my AR-15 or LR-308 gas block?

Yes, if you're using an Aero Precision low-profile gas block with a barrel that measures .625, .750, .825, or .936 inches OD. Verify your barrel's outer diameter before ordering to ensure compatibility.

Can I use red thread locker on this set screw?

Aero does not recommend red thread locker on the screw threads. If you want additional security, use a non-permanent thread locker formula instead.

Does this come with a roll pin?

No, this set screw ships without a roll pin. Check your gas block's design to determine if a separate roll pin is required for your build.

What's the difference between a low-profile gas block and a standard one?

Low-profile gas blocks sit lower on the barrel, reducing interference with rail systems and handguards mounted close to the barrel. They're ideal for modern rifle builds with integrated or free-floating fore-ends.