Battle Arms Development WORKHORSE Complete Upper Features The Battle Arms Development WORKHORSE Complete Upper is built on a forged 7075-T6 aircraft-grade aluminum receiver chosen for its strength-to-weight ratio and resistance to flexing under hard use. Its free-float M-LOK handguard isolates the barrel from the forend which improves accuracy potential by keeping grip pressure slings and accessories from influencing barrel harmonics. Attachment points at the 3 6 and 9 o clock positions give builders flexibility to mount lights grips bipods and other accessories wherever they are needed while the full-length top Picatinny rail runs from the receiver forward for uninterrupted optic mounting. A signature notch cut in the rail matches the upper receiver carrying the WORKHORSE line s distinct styling across the build. Every barrel on this upper is machined from 4150 chrome-moly steel and finished in black nitride for both durability and corrosion resistance then individually headspaced for a precise reliable chamber fit. A matching 9310 steel bolt paired with an 8620 black nitride bolt carrier rounds out a bolt carrier group built for smooth cycling and straightforward cleaning after heavy use. The included Bad Rack-15 ambidextrous charging handle lets shooters manipulate the action from either side of the rifle a detail that matters for left-handed shooters and dynamic shooting positions alike. Complete and ready to install the Battle Arms Development WORKHORSE upper gives builders a 16-inch 5.56 NATO upper with the handguard barrel and bolt carrier group already assembled. Battle Arms Development WORKHORSE Complete Upper Specifications Manufacturer: Battle Arms Development Model: WORKHORSE Complete Upper Caliber: 5.56 NATO Barrel Length: 16 Color: Black Includes: Bad Rack-15 Charging Handle AR15/M16 Bolt Carrier Group Handguard: M-LOK Compatible Hosts: AR-15 Available At: GrabAGun