The Phase 5 Weapon Systems Lo-Pro Gas Block is a low-profile AR-15 gas block machined from 4140 chromoly steel with a mag phosphate finish, brand part number LOPROGAS. It replaces the factory front sight to give the rifle a cleaner, low-profile look, and its slim design lets a rifle-length handguard mount over a carbine-length barrel without interference. Installation is straightforward, using two set screws to lock the block onto a 0.750-inch barrel, and the whole unit is made in the USA. Note that this listing is for the gas block only; the gas tube roll pin is not included.

Key Specifications

• Replaces the factory front sight for a clean, low-profile look.
• Low-profile design allows a rifle-length handguard over a carbine-length barrel.
• Mounted using two set screws.
• Compatible with 0.750-inch barrels.
• Machined from 4140 chromoly steel.
• Finished in mag phosphate for corrosion resistance.
• Measures 0.95 inches across.
• Made in the USA.
• Gas tube roll pin is not included.

Frequently Asked Questions

What barrel diameter does this fit? 0.750-inch barrels.

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

Is it made in the USA? Yes.

Buy the Phase 5 Lo-Pro Gas Block

Clean up your rifle’s profile with this gas block from Phase 5 Weapon Systems, part of our AR15 accessories lineup. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.