Daniel Defense DDM4 GL/SSC Complete Upper Receiver 12.5" CHF Barrel - RIS II 11.5" FDE Quad Rail - 25th Anniversary Reissue The Daniel Defense DDM4 GL/SSC complete upper receiver represents the return of a legend. The once-unobtainable GL/SSC (Grenade Launcher/Sound Suppressor Capable) handguard that helped put Daniel Defense on the map is now available for the first time as part of the company's 25th anniversary celebration. Only 125 original GL/SSC rails were reportedly made-100 went to the military and 25 into private hands, making it an obscure object of great desire for clone enthusiasts. Features 12.5" cold hammer forged government profile barrel with 1:7 twist, chrome-lined, heavy-phosphate coated, carbine-length gas system. The battle-proven GL/SSC RIS II 11.5" free-float quad rail system in Flat Dark Earth retains M203 grenade launcher mounting capability. Includes A2 flash hider, pinned low-profile gas block. New production GL/SSC rails are marked "Savannah, GA" rather than the "Black Creek, GA" markings of the original 125 units. MPN: 02-088-00385-047. 25th Anniversary GL/SSC Reissue Daniel Defense celebrates its 25th anniversary by bringing back the legendary GL/SSC configuration. The original GL/SSC was a slightly shorter RIS II variant intended for 12.5" barrel use, maintaining grenade launcher mounting ability in a more compact package. The new production rails are marked "Savannah, GA" to distinguish them from the original 125 units marked "Black Creek, GA." 12.5" Cold Hammer Forged Barrel The 12.5" barrel is cold hammer forged from 4150 Chrome Moly Vanadium steel with government profile, chrome-lined bore, and Mil-Spec heavy phosphate coating. The 1:7 twist rate stabilizes a wide range of bullet weights including heavier 77-grain match ammunition. Threaded 1/2x28 with A2 flash hider. GL/SSC RIS II 11.5" FDE Quad Rail The free-floating, battle-proven GL/SSC RIS II Rail System provides four continuous Picatinny rails for maximum accessory mounting flexibility. This slightly shorter variant retains the grenade launcher mounting ability of the original through its versatile two-piece design. CNC machined from 6061-T6 aluminum with Type III hard coat anodized Flat Dark Earth finish. M203 and Suppressor Compatible The GL/SSC design accommodates both M203 grenade launcher mounting (or M320 with adapters) and suppressor use. The free-float handguard allows for M203 attachment without contacting the barrel, ensuring accuracy is not affected during operation. The Daniel Defense DDM4 GL/SSC upper delivers legendary quad rail heritage with authentic SOPMOD Block II aesthetics. SPECIFICATIONS Manufacturer: Daniel Defense Model: DDM4 GL/SSC Complete Upper Receiver MPN: 02-088-00385-047 Special Edition: 25th Anniversary Reissue Caliber: 5.56 NATO (.223 Remington compatible) Barrel Length: 12.5 inches Barrel Type: Cold Hammer Forged (CHF), Government Profile Barrel Material: 4150 Chrome Moly Vanadium Steel Barrel Finish: Chrome-Lined, Heavy-Phosphate Coated Twist Rate: 1:7 inches Barrel Threads: 1/2x28 Gas System: Carbine-Length Gas Block: Pinned Low-Profile Operating System: Direct Impingement Handguard: GL/SSC RIS II 11.5 inches Rail Type: Quad Rail (4-sided Picatinny) Handguard Finish: Flat Dark Earth (FDE) Handguard Material: 6061-T6 Aluminum, CNC Machined Handguard Features: Free-Float, M203/M320 compatible, Suppressor compatible Upper Receiver Material: 7075-T6 Aluminum Muzzle Device: A2 Flash Hider Markings: "Savannah, GA" (new production) Original Production: 125 units (100 military, 25 private)