Rock River Arms Upper Receiver A4 .223 Wylde 18 Inch Barrel Varmint Profile 1-8 Twist Free-Float Handguard Black
4 options
- 16"out of stock
- 18", this page
- 20"out of stock
- 24"out of stock
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Rock River Arms
Overview
The Rock River Arms Upper Receiver A4 is a complete assembly featuring an 18-inch barrel with a .223 Wylde caliber, allowing for versatility in ammunition choices. The 1:8 twist rate is optimal for stabilizing a wide range of bullet weights, making this upper ideal for precision shooting and varmint hunting. This configuration is commonly found in builds aimed at accuracy and long-range performance.
Specifications
Rock River Arms Upper Receiver A4 .223 Wylde 18 Inch Barrel Varmint Profile 1-8 Twist Free-Float Handguard Black
4 options
- 16"out of stock
- 18", this page
- 20"out of stock
- 24"out of stock
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Build history on GunPartPicker
Builders on GunPartPicker first added the Rock River Arms Upper Receiver A4 .223 Wylde 18 Inch Barrel Varmint Profile 1-8 Twist Free-Float Handguard Black to a build in March 2026.
Updated · from real builds on GunPartPicker
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