LBE Unlimited AR137RBK | 13.7″ CHF Barrel | 5.56 NATO

The LBE Unlimited AR137RBK Ready Build Kit centers on a premium 13.7-inch cold hammer forged barrel finished in melonite and packaged as a complete AR-15 upper assembly. It is intended for use in AR pistol or SBR builds and includes the core components needed to assemble a compact, short-range platform. Components are precision machined and built for repeatable function and field serviceability.

Product Specifications

• The manufacturer is LBE Unlimited.
• The model is the AR137RBK Ready Build Kit.
• The UPC is 706612408141.
• The caliber is .223 Rem/5.56 NATO.
• The barrel measures 13.7 inches.
• The barrel is cold hammer forged for enhanced durability.
• The barrel finish is melonite for corrosion resistance.
• The kit includes a complete upper receiver with dust cover and forward assist installed.
• The bolt carrier group included is a NiB M16-style BCG.
• The handguard is a free-floating design for accessory mounting and consistent harmonics.
• The package includes a gas tube and a low-profile gas block.
• The charging handle included is a standard AR-style unit.
• The muzzle device is an A2 birdcage flash hider and it ships with a crush washer.
• The kit fitment is specified for AR-15 platforms.
• The exterior color is black.

This Ready Build Kit provides a compact, serviceable upper that is well suited to short-range precision and competitive or training applications where a durable, easily configurable AR platform is required. The combination of a cold hammer forged barrel, melonite finish, and a full complement of upper components gives builders a straightforward foundation for a compact rifle or pistol configuration.