This TacFire Assembled Gas Block and Gas Tube combo pairs a .750-inch low-profile gas block with a pistol-length gas tube from TacFire (brand part no. MAR009-750GB), giving AR-15 builders a matched, ready-to-install gas system in one package. The .750-inch bore fits the common low-profile gas block size used on most mil-spec AR-15 barrels, and the low-profile housing keeps clearance under free-float handguards without requiring a cut window. Because the block and tube ship pre-assembled, there’s no separate roll-pin fitting between two mismatched parts. It’s a practical, no-fuss option for anyone building a pistol-length gas system from scratch or replacing a worn gas tube.

Key Specifications

• Sized for .750-inch gas block barrels, the standard low-profile diameter on most mil-spec AR-15 barrels.
• Built as a low-profile gas block, so it clears free-float handguards without needing a cut relief window.
• Paired with a pistol-length gas tube sized for pistol-length gas systems.
• Ships pre-assembled, with the block and tube already mated for a faster install.
• Finished in black to match standard AR-15 furniture and coatings.

Frequently Asked Questions

What gas system length is this tube built for? It’s a pistol-length gas tube, matched to pistol-length AR-15 gas systems.

Will this fit under a free-float handguard? Yes, the low-profile gas block design keeps clearance under most free-float handguards without cutting a window.

Buy the TacFire .750 Low Profile Gas Block & Gas Tube

Complete your AR-15 gas system with this matched TacFire block-and-tube set, sized right and ready to pin in place. It ships fast from our Lubbock, Texas gun shop, and our AR gas system parts selection covers other gas system parts for your build.