The LBE Unlimited Ready Build Kit (brand part number AR75RBK) is a compact AR-15 upper build kit chambered in .223 Remington/5.56 NATO, featuring a premium 7.5-inch Cold Hammer Forged barrel engineered for durability and high performance in a pistol-length gas system. Designed for AR pistol or SBR builds, the kit includes a complete upper receiver, a free-floating handguard, a gas block, a gas tube, and the CHF barrel itself, giving builders a rugged, close-quarters-ready AR platform out of the box.

Key Specifications

• Chambered in .223 Remington/5.56 NATO.
• Barrel length is 7.5 inches, manufactured using the Cold Hammer Forged process for durability.
• Gas system is pistol-length.
• Includes a complete upper receiver, free-floating handguard, gas block, and gas tube.
• Configuration target is AR pistol or SBR builds.

Frequently Asked Questions

What does this kit include? It includes a complete upper receiver, a free-floating handguard, gas block, gas tube, and the 7.5-inch Cold Hammer Forged barrel.

Is this legal to buy without an SBR registration? Yes, it ships as an upper only with no lower receiver; a 7.5-inch barrel is fine on a pistol-configured lower, but installing it on a shouldered, stocked lower would require a registered SBR.

Buy the LBE Unlimited Ready Build Kit

Get a durable, close-quarters-ready upper for your next build. Shop more LBE Unlimited kits in our AR15 uppers selection, and this kit ships fast from our Lubbock, Texas gun shop.