The Faxon 350 Legend barrel (brand part number 15AL16C20NGQ) is a 20-inch AR-15 barrel button-rifled from 4150 chrome moly vanadium steel and finished inside and out with a durable nitride coating. It’s cut with a 1:16 twist matched to 350 Legend’s SAAMI-spec bullet weights and built in Faxon’s Gunner profile with a carbine-length gas system. The barrel carries a .750-inch gas block diameter with a 1.9-inch gas block journal, an M4 barrel extension, and 1/2×28 muzzle threads, and it’s finished with an 11-degree target crown to protect the rifling and support accuracy. At 1.61 pounds, it keeps a 350 Legend upper reasonably light despite the 20-inch length.

Key Specifications

• Chambered in 350 Legend, SAAMI spec.
• Barrel length measures 20 inches.
• Rate of twist is 1:16, matched to 350 Legend bullet weights.
• Machined from 4150 chrome moly vanadium steel, button rifled.
• Finished with nitride coating both inside and out.
• Built in Faxon’s Gunner profile with a carbine-length gas system.
• Gas block diameter is .750 inches with a 1.9-inch gas block journal.
• Muzzle is threaded 1/2×28 TPI.
• Weighs approximately 1.61 pounds.
• Finished with an 11-degree target crown to protect accuracy.

Frequently Asked Questions

What gas system does this barrel use? A carbine-length gas system, built around Faxon’s Gunner profile.

What twist rate does this barrel use? A 1:16 twist, matched to 350 Legend’s SAAMI-spec bullet weights.

How much does this barrel weigh? Approximately 1.61 pounds.

Buy the Faxon 350 Legend AR-15 Barrel, 20 Inch Gunner Profile, Black Nitride

Build a reliable 350 Legend upper around a proven barrel. Order from our Faxon Firearms lineup of AR-15 barrels from a Lubbock, TX gun shop.