The Brownell's Retro A1 12.7 inches carbine length barrel assembly is a meticulously crafted component for retro style rifle enthusiasts and builders. It is chambered in 5.56x45mm and offers two rifling options - a fast 1-7 inches twist for heavier projectiles and a classic 1-12 inches twist for lighter rounds, accommodating various shooting preferences. Constructed from durable 4150 chrome moly steel with a robust chrome lining, the barrel ensures longevity and consistent performance. It features a sleek black phosphate finish and measures 12.7 inches in length, making it ideal for compact carbine builds. The muzzle is threaded at 1/2-28 for easy attachment of muzzle devices and a standard barrel extension at the rear ensures compatibility with various upper receivers. Each assembly includes a .625 inches front-sight base without F marks and essential components such as a sight post, detent, spring, sling swivel, rivet, flat Delta ring, barrel nut, weld spring, snap ring and a round handguard cap, all pre-installed for convenience. This comprehensive package simplifies the assembly process, making it suitable for both novice and experienced builders. Whether starting a new retro rifle project or upgrading an existing build, the Brownell's Retro A1 12.7 inches carbine length barrel assembly offers the reliability, authenticity and performance needed to achieve desired results.

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