The Spike's Tactical ST-15 Enhanced Mid-Length Upper is a Mil-Spec compliant 5.56mm AR-style upper designed for dependable performance with a 16 in cold hammer forged (CHF) barrel. It pairs a mid-length gas system with a ST Micro gas block, an M16 bolt carrier group, and a 12 in quad rail for secure mounting of lights, optics, and other accessories.

Key features

• 16 in 1:7 twist CHF Mil-Spec barrel for reliable stabilization across common 5.56mm loads
• Mid-length gas system for a balanced operating impulse
• ST Micro gas block with .750 in diameter gas seat
• Mil-Spec M16 bolt carrier group for dependable cycling
• ST BAR2 12 in quad rail for flexible accessory mounting
• A2 flash hider for conventional muzzle control characteristics

Build your next lightweight, versatile AR setup with a Mil-Spec oriented upper from Spike's Tactical.