Geissele URG-I MK16 Complete Upper — 5.56 NATO, DDC

The Geissele URG-I (MK16) complete upper receiver is a near-clone of the USASOC URGI configuration built for AR-15 systems chambered in .223 Rem / 5.56 NATO. It pairs a chrome-lined steel barrel with Geissele’s Super Modular Rail MK16 handguard finished in Desert Dirt Color (DDC) and an anodized MIL-Spec M4 receiver. The design is intended for robust service use and was developed to handle modern ammunition such as M855A1 (AB57). This upper ships as a complete assembly to install on a compatible AR-15 lower.

Key Specifications

• Caliber: .223 Rem / 5.56 NATO.
• Barrel material/description: Chrome-lined steel.
• Barrel finish: Black.
• Barrel length: varies by listing (10.50″ and 10.3″ reported); see notes for details.
• Rate of twist: 1:7.
• Handguard: Super Modular Rail MK16 with M-LOK attachment and DDC finish.
• Receiver: MIL-Spec M4 upper receiver.
• Contour: Government contour barrel.
• Fit: AR-15 platform compatibility.
• Model: URG-I (MK16) complete upper.

This complete upper is specified for shooters who need a factory-configured AR-15 upper with military-influenced features, modern handguard ergonomics, and components designed to withstand duty-level ammunition. Its combination of a chrome-lined barrel and a rugged MK16 handguard delivers a durable, versatile package intended for range work, training, and field use.