7.5″ 5.56mm 1:7 Twist Contour 4150 Barrel (High Polish Tin Coated)

Description

This 7.5″ barrel is chambered for 5.56/.223 ammunition, featuring a 1:7 twist rate optimized for stabilizing heavier projectiles. Constructed from 4150 Chromoly Steel, it provides the necessary tensile strength and heat resistance for reliable operation. The exterior is finished with a High Polish Tin Coating, which serves as an aesthetic enhancement while improving surface durability and lubricity compared to standard finishes.

Engineered for compact builds, this barrel utilizes a .750 Gas Platform System paired with a Pistol Length Gas System. This configuration is critical for ensuring proper gas timing and reliable cycling in shortened receiver setups. The interior features M4 Feed Ramps to facilitate smooth cartridge feeding from standard magazines. The muzzle end is threaded to 1/2 by 28 Thread specifications, allowing for the attachment of compatible muzzle devices or suppressors.

• Material: 4150 Chromoly Steel
• Chamber: 5.56/.223
• Twist Rate: 1:7
• Finish: High Polish Tin Coating
• Gas System: Pistol Length
• Gas Block: .750 platform
• Feed Ramps: M4 Spec
• Threading: 1/2 by 28
• Weight: 15.8 oz

The barrel includes spiral engraving near the break point for identification. Its solid contour profile supports the structural integrity required for a 7.5″ length of barrel, making it a precise component for builders requiring specific dimensions and gas system compatibility.