ROSCO SaucePackage 16" 5.56 Complete Upper w/ BCG & Charging Handle

The ROSCO SaucePackage delivers a precision-engineered 16-inch upper receiver assembly that transforms any AR-15 lower into a reliable 5.56 NATO platform. This complete upper package includes bolt carrier group and charging handle, eliminating the need for separate component sourcing.

What Makes This Different

ROSCO's manufacturing process utilizes 4150 chrome moly vanadium steel barrels with a 1:7 twist rate optimized for both 55-grain and 77-grain projectiles. The barrel undergoes magnetic particle inspection and receives a nitride finish that provides superior corrosion resistance compared to standard phosphate coatings. Each upper receiver is machined from 7075-T6 aluminum forgings and features M4 feed ramps for enhanced reliability.

Key Features

• 16-inch barrel with 1:7 twist rate handles 55gr to 77gr ammunition
• Nitride-finished 4150 CMV steel barrel for extended service life
• Complete bolt carrier group with properly staked gas key
• Mil-spec charging handle with extended latch design
• Low-profile gas block with roll pin retention system
• M4 feed ramps machined into barrel extension
• Carbine-length gas system reduces bolt velocity and wear

Field testing demonstrates consistent 1.5-2 MOA accuracy with quality ammunition across various environmental conditions. The carbine-length gas system provides reliable cycling with both M193 ball and M855 penetrator rounds while reducing bolt carrier velocity for improved component longevity. This configuration excels in tactical applications, competitive shooting, and general sporting use where reliability takes precedence over specialized features.

Technical Specs

• Barrel Length: 16 inches
• Caliber: 5.56 NATO/.223 Remington
• Twist Rate: 1:7 right-hand twist
• Gas System: Carbine length
• Barrel Material: 4150 Chrome Moly Vanadium steel
• Barrel Finish: Salt bath nitride
• Upper Receiver: 7075-T6 aluminum forging
• Thread Pitch: 1/2x28 TPI
• Overall Length: Approximately 20.75 inches
• Weight: 2.8-3.2 pounds (complete assembly)

This complete upper assembly streamlines the build process while maintaining the quality standards expected from precision rifle components. ROSCO's attention to manufacturing tolerances and material selection ensures consistent performance across thousands of rounds without the compatibility concerns of mixing components from multiple manufacturers.