The Phase 5 Weapon Systems Lo-Pro Gas Block (brand part number LOPROGAS) replaces a standard AR-15 front sight base with a low-profile design built to clear a free-float rail system. Phase 5 machines the block from 4140 chromoly steel and finishes it in mag phosphate for corrosion resistance, and two clamping screws secure it to a 0.750-inch barrel without the need for a set screw or roll pin through the barrel itself. It’s a straightforward way to mount a rifle-length forearm to a carbine-length barrel, or simply clean up the top of a build that’s getting a free-float handguard. Made in the USA; the gas tube roll pin is not included.

Key Specifications

• Low-Profile Design clears a free-float rail system in place of a standard front sight base.
• 4140 Chromoly Steel Construction holds up to sustained heat and pressure at the gas port.
• Mag Phosphate Finish resists corrosion under repeated firing.
• Clamp-On Mounting secures with two screws, no set screw or roll pin through the barrel.
• 0.750-Inch Barrel Compatibility fits the most common AR-15 barrel gas-block diameter.
• Rifle-Length Forearm Compatibility lets a rifle-length handguard mount over a carbine-length barrel.
• Gas Tube Roll Pin Not Included — reuse your existing roll pin during installation.
• Made in the USA construction backs the part with domestic manufacturing.

Frequently Asked Questions

Does this include the gas tube roll pin? No, the gas tube roll pin is not included.

What barrel diameter does this fit? A 0.750-inch gas-block barrel diameter.

Why choose a low-profile gas block? It clears a free-float rail system, unlike a standard front sight base.

Buy the Phase 5 Weapon Systems Lo-Pro Gas Block, 0.750-Inch, Mag Phosphate

Clean up your upper with a Phase 5 Weapon Systems Lo-Pro Gas Block from our AR gas system selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.