$386.99 Del-Ton Upper Receiver AR-15 M4 5.56 16 Flattop Pre
Barrel: Chrome Moly Vanadium M4 Feed Ramps 16 Length 1x9 Twist A2 Flash Hider Manganese Phosphated Phosphated Under Front Sight Base Taper Pins On A2 Front Sight Base Threaded Muzzle M4 Profile Chamber: 5.56 X 45 Mm Bolt And Carrier: Phosphated 8620 Steel Carrier Assembly Carpenter 158 Bolt Hpt/mpi Tested Heat Treated And Plated Mil-spec Chrome Lined Carrier Interior Carrier Key Chrome Lined Attached With Grade 8 Screws Properly Staked & Sealed Gas Key Handguards: Carbine Length Aluminum Delta Ring Single Heat Shield Upper Receiver: Forged 7075 T6 Aluminum A3 Flat Top With M4 Feed Ramps Hard Coat Anodized Mil-spec Ejection Port Cover And Round Forward Assist Right Hand Ejection Bore's Surface Is Coated With Dry Film Lube Over The Anodized Surface
https://www.cactustactical.com/Del-Ton-Upper-Receiver-AR-15-M4-556-16-Flattop-Pre_p_9999.html