The Spike’s Tactical ST-15 Enhanced upper line-up is designed as a fully
Mil-spec compliant upper series for law enforcement. This same level of
quality and performance is now available to everyone, all at a price range
that is affordable to shooters of any budget. Each component is
manufactured to Mil-spec standards. This model features 16″ with 1:7 Twist
cold hammer forged Mil-spec Barrel, ST Optimum Profile, Mid Length Gas
System, ST Micro Gas Block, .750″ Diameter Gas Seat, Spike’s Tactical
Mil-Spec M16 Bolt Carrier Group, ST BAR2 12″ Rail, and A2 flash hider.