The WORKHORSE Complete Upper Receiver is purpose-built around a forged 7075-T6 aircraft-grade aluminum receiver and free-float rail handguard with M-LOK attachment points at 3 6 and 9 o'clock positions.WORKHORSE Complete AR-15 Upper Receiver16" barrel chambered in 5.56 NATO4150 chrome-moly steel barrel with black nitride finishFree-float M-LOK handguard with full-length Picatinny rail at 12 o'clockIncludes Bad Rack-15 Ambidextrous Charging HandleComplete with AR-15/M16 Bolt Carrier Group (9310 steel bolt 8620 black nitride carrier)Black anodized finishIndividually head-spaced for ultimate reliabilityEngineered for durability and accuracy this complete upper receiver delivers ultimate reliability and ease of cleaning perfect for tactical applications sport shooting or precision builds.