Rock River Arms complete Tactical Carbine upper is an A4 upper chambered in .458 SOCOM with a 16″ chrome moly bull barrel and 1:14 twist. Additionally the upper comes with a complete bolt carrier group, charging handle assembly, 15″ RRA lightweight M-Lok compatible free float rail and a RRA Operator brake with a a 5/8-32 thread pitch.
MANUFACTURER: Rock River Arms
MPN: SOC0564
MODEL: Tactical Carbine
Barrel Length: 16″
Finish: Anodized
Fit: AR-15
Caliber: 458 Socom
Type: Upper
Color: Black
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