The Rosco Manufacturing SaucePackage Complete Upper Receiver Group delivers precision-engineered performance for 300 Blackout applications. This complete upper assembly combines Rosco's proven barrel technology with a matched bolt carrier group for consistent accuracy and reliable cycling. The system addresses common compatibility issues found in mixed-component builds through factory-matched tolerances and testing.
What Makes This Different
Unlike piecemeal upper assemblies, this complete package undergoes factory headspacing and function testing before shipment. The integrated approach eliminates timing issues between barrel extension and bolt that can cause extraction problems or accuracy degradation. Rosco's proprietary barrel profile optimizes gas port pressure for both subsonic and supersonic 300 Blackout loads, delivering consistent performance across the ammunition spectrum.Key Features
- Complete factory-assembled upper receiver group with matched components
- 300 Blackout chambered barrel with optimized gas port sizing
- Nitride-treated bolt carrier group for enhanced durability and corrosion resistance
- Mil-spec upper receiver with M4 feed ramps and T-markings
- Low-profile gas block for compatibility with free-float handguards
- Standard carbine-length gas system for reliable cycling
- Factory headspaced and function tested for immediate installation
Technical Specs
- Caliber: 300 AAC Blackout (.300 BLK)
- Barrel length: 8.2 inches
- Gas system: Carbine length
- Barrel treatment: Nitride finish
- Upper receiver: 7075-T6 aluminum, Type III hard coat anodized
- Bolt carrier group: 8620 steel bolt, Carpenter 158 steel carrier
- Thread pitch: 5/8x24 TPI for suppressors and muzzle devices
- Overall weight: Approximately 2.8 pounds
- Made in USA with lifetime warranty
