Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 16 Inch Barrel Mid-Length Profile 1-9 Twist 1/2-28 Thread A2 Flash Hider w/Gas Block
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Rock River Arms
Overview
The Rock River Arms Completed Pistol Upper Receiver A4 features a complete assembly designed for AR-15 platforms, equipped with a 16-inch barrel that offers a mid-length gas system for smoother cycling and reduced recoil. It is chambered in 5.56 NATO and has a 1:9 twist rate, making it versatile for stabilizing a variety of bullet weights. This upper receiver is commonly used in lightweight builds where maneuverability and handling are prioritized.
Specifications
Rock River Arms Completed Pistol Upper Receiver A4 .223/5.56mm 16 Inch Barrel Mid-Length Profile 1-9 Twist 1/2-28 Thread A2 Flash Hider w/Gas Block
Frequently Built With
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
Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom
Lower ReceiverBuild Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with 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 | 259 |
| Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock | Lower Receiver | 230 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 166 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 160 |
| Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom | Lower Receiver | 142 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 100% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 100% |
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