Geissele Automatics Geissele Super Duty MOD1 5.56mm 16″ Heavy Bbl (.750 Journal) DDC Complete Upper Receiver 08-627S

The Geissele Super Duty MOD1 16″ Heavy Barrel Complete Upper Receiver in Distressed Diamond Cut is a premium AR-15 upper assembly built around a rugged cold hammer forged, chrome-lined 16in barrel with a .750-inch gas journal and a 1:7 twist for broad ammunition compatibility and enhanced heat capacity. Featuring a mid-length gas system with a Super Compact gas block and an MK16 M-LOK free-float rail, this upper is optics-ready with a full Picatinny rail for sights and accessories. Designed to mate with any compatible AR-15 lower, the 08-627S provides the core high-performance components for a durable, precision-oriented rifle build. Sold without BCG and charging handle, the complete upper simplifies assembly of your custom rifle while delivering top-tier Geissele engineering and finish quality. Geissele Automatics Geissele Super Duty MOD1 5.56mm 16″ Heavy Bbl (.750 Journal) DDC Complete Upper Receiver 08-627S