The Leapers UTG Micro Gas Block (brand part no. MNT-ARMGB01) is a low-profile gas block built for AR-15 rifles running a .750-inch gas port barrel. Machined from 4140 steel and finished in durable phosphate, it seats cleanly beneath most free-float handguards without adding bulk to the barrel profile. Leapers backs the UTG line with tight manufacturing tolerances, making this block a straightforward, reliable upgrade or replacement for a direct impingement gas system. It is a solid pick for builders who want a clean, snag-free look under a slim handguard without sacrificing gas system reliability.

Key Specifications

• Sized for a .750-inch gas port diameter, matching the most common mil-spec AR-15 barrel journal.
• Low-profile design fits underneath most free-float handguards for a clean rifle silhouette.
• Body is precision-machined 4140 steel for strength and dimensional accuracy at the gas port.
• Finished in durable phosphate, which resists corrosion and holds up to repeated firing heat cycles.
• Built for direct impingement gas systems, the standard operating system on most AR-15 platforms.
• Overall block length runs about 1.15 inches, keeping the low-profile footprint compact.
• Includes a gas tube roll pin so the gas tube installs without sourcing a separate pin.
• Ships with serrated self-locking set screws that resist loosening under recoil.
• A 3/32-inch Allen wrench is included for a complete, tool-ready installation.
• Leapers specifies a 12 in-lbs torque value for the set screws to avoid over-tightening the block.

Frequently Asked Questions

Will this fit a .750-inch gas port barrel? Yes, this block is sized specifically for .750-inch diameter barrels at the gas port.

Does it work with a free-float handguard? Yes, the low-profile design is built to sit underneath most free-float AR-15 handguards.

Is installation hardware included? Yes, it ships with a gas tube roll pin, set screws, and a 3/32-inch Allen wrench.

Buy the Leapers UTG Micro Gas Block

Whether you are finishing a fresh Leapers upper build or swapping out a damaged factory block, this micro gas block gets your direct impingement system running true without adding visual bulk. Browse more parts in our AR gas system lineup, and order it from our Lubbock, Texas gun shop for fast, reliable shipping.