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Geissele Automatics
Overview
The Geissele Automatics Mk16 Urg-I Complete Upper Receiver is designed for the AR-15 platform, featuring an 11.5-inch barrel chambered in 5.56 NATO. This complete assembly incorporates a carbine-length gas system, making it suitable for a variety of applications while maintaining reliable cycling and performance. Builders often choose this upper for compact builds that prioritize maneuverability without sacrificing firepower.
Based on build data

BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock
Lower Receiver
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green
Charging Handle
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Gas BlockAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 360 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 260 |
| Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock | Lower Receiver | 231 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 166 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 161 |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | Gas Block | 143 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 100% |
| Gas System | Percentage |
|---|---|
| Carbine | 100% |
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