Daniel Defense DDM4 GL/SSC 5.56mm Complete Upper Receiver, 12.5" Threaded Barrel, Govt Profile, FDE Overview: The Daniel Defense DDM4 GL/SSC Complete Upper Receiver is a 25th Anniversary Reissue built around a 12.5-inch cold hammer forged barrel and the GL/SSC RIS II free-float quad rail. Chambered in 5.56 NATO and compatible with .223 Remington, this complete upper combines durable materials, a carbine-length direct-impingement gas system, and a compact profile for compatible AR-style rifle configurations. Key Features: 25th Anniversary Reissue: Special-edition recreation of the DDM4 GL/SSC configuration. Cold Hammer Forged Barrel: 12.5-inch Government Profile barrel constructed from 4150 Chrome Moly Vanadium steel. Chrome-Lined Bore: Designed for durability and dependable performance. Carbine-Length Gas System: Direct-impingement operating system with a pinned low-profile gas block. RIS II Quad Rail: GL/SSC RIS II 11.5-inch free-float handguard with four-sided Picatinny rail surfaces. FDE Handguard: Flat Dark Earth finish complements the special-edition configuration. Threaded Muzzle: 1/2x28 muzzle threads with an A2 flash hider installed. M203/M320 Compatible: Handguard is compatible with applicable M203/M320 mounting configurations. Specifications: Manufacturer: Daniel Defense Model: DDM4 GL/SSC Complete Upper Receiver Product Type: Complete Upper Receiver Special Edition: 25th Anniversary Reissue Caliber: 5.56 NATO / .223 Remington Compatible Barrel Length: 12.5" Barrel Profile: Government Barrel Material: 4150 Chrome Moly Vanadium Steel Barrel Manufacturing: Cold Hammer Forged Barrel Finish: Chrome-Lined / Heavy Phosphate Coated Twist Rate: 1:7" Barrel Threads: 1/2x28 Gas System: Carbine-Length Gas Block: Pinned Low-Profile Operating System: Direct Impingement Handguard: GL/SSC RIS II Handguard Length: 11.5" Rail Type: Four-Sided Picatinny Quad Rail Handguard Material: CNC-Machined 6061-T6 Aluminum Handguard Finish: Flat Dark Earth Handguard Design: Free-Float Upper Receiver Material: 7075-T6 Aluminum Muzzle Device: A2 Flash Hider Applications: Range Training: Compact upper configuration suitable for compatible rifle platforms. Collection Builds: 25th Anniversary Reissue design appeals to collectors and Daniel Defense enthusiasts. Optic and Accessory Setup: Full-length Picatinny rail surfaces provide mounting options for compatible accessories. Suppressed Configurations: Handguard design is compatible with appropriate suppressor setups. Additional Features: Durable Construction: Combines a forged 7075-T6 aluminum upper with a CHF steel barrel and CNC-machined aluminum handguard. Free-Float Rail System: Helps isolate the handguard from the barrel while providing extensive accessory mounting space. Compact Configuration: The 12.5-inch barrel and 11.5-inch handguard create a streamlined upper receiver assembly. Complete Upper: Includes the upper receiver assembly with the listed barrel, handguard, gas system, and A2 flash hider. MPN: 23-004-20154-047UPC: 818773025355 Please check out our special deals on 5.56mm ammo.