Green Mountain 5.56 AR-15 Barrel 14.5" M4 A1 Phosphate - GM-M62

Upgrade your AR-15 build with the precision-engineered Green Mountain 5.56 AR-15 Barrel in a 14.5-inch M4 A1 configuration. Designed for reliability and performance in demanding tactical and sporting applications, this barrel delivers consistent accuracy and durability thanks to its premium construction and thoughtful engineering.

Key Features and Benefits

• Chrome-Lined Bore and Chamber: The phosphate-finished exterior pairs with a chrome-lined interior to resist corrosion, reduce fouling, and extend service life—ideal for high-round-count shooting without frequent cleaning.
• M4 Profile with Carbine Gas System: The classic M4 contour optimizes weight distribution while the carbine-length gas system ensures reliable cycling across a wide range of ammunition and suppressor setups.
• 1:7 Twist Rate: Stabilizes heavier 5.56 NATO and .223 Remington projectiles for superior long-range accuracy and terminal performance.
• 0.75″ Gas Block Journal and 1/2×28 Muzzle Threads: Compatible with standard gas blocks and a variety of muzzle devices, giving builders maximum flexibility.

Technical Specifications

• Caliber: 5.56 NATO
• Barrel Length: 14.5 inches
• Profile: M4
• Gas System: Carbine
• Twist Rate: 1:7
• Finish: Phosphate exterior with chrome-lined bore and chamber
• Gas Block Journal: 0.75 inches
• Muzzle Thread: 1/2×28
• Platform: AR-15
• Weight: 29.6 oz

Why Choose This Green Mountain Barrel?

Green Mountain barrels are trusted by builders seeking mil-spec quality without compromise. The combination of button-rifled precision, stress-relieved steel, and proven chrome lining addresses common pain points like accuracy degradation and maintenance demands. Whether you’re assembling a compact carbine for home defense, competition, or range use, this barrel provides the foundation for a dependable, accurate rifle.

Invest in a component that prioritizes performance and longevity—engineered to meet the exacting standards of serious shooters.