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.
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