The LMT Monolithic 5.56x45 NATO 10.5" Carbine Length BBL Black is a purpose-built barrel assembly engineered for LMT’s MRP monolithic upper receivers. This 10.5-inch chrome moly steel barrel is chrome lined and finished in a durable manganese phosphate coating, paired with a low profile gas block, straight carbine-length gas tube, and A2 birdcage flash hider to deliver reliable performance and reduced muzzle flash in a compact package.

With its 1:7 right-hand twist and 5.56x45 NATO chamber, this barrel is ideal for shooters who want a short, accurate carbine for training, range use, or duty-style configurations where maneuverability matters. The cryogenically treated bore and rugged construction support long-term durability and consistent accuracy over extended round counts. Backed by LMT Defense’s reputation for precision machining and rigorous barrel testing, this assembly offers a refined upgrade for any compatible MRP build.

Key Features:

• Manufacturer: LMT Defense
• Model: MRP
• Caliber: 5.56x45 NATO (.223)
• Barrel Length: 10.5"
• Gas System Length: Carbine
• Twist Rate: 1:7" RH
• Barrel Material: Chrome moly steel, chrome lined
• Barrel Finish: Manganese phosphate
• Muzzle Device: A2 birdcage flash hider
• Gas Block: Low profile with straight gas tube
• Item Weight: 1.5 lbs