Daniel Defense M4A1 FSP Upper Receiver Group 14.5″ 5.56 Flat Dark Earth

Built to the exacting standards of the USSOCOM SOPMOD Block II configuration, the Daniel Defense M4A1 FSP Upper Receiver Group delivers military-grade performance for serious shooters, collectors, and professionals. This premium AR-15 style upper is chambered in 5.56 NATO and finished in Flat Dark Earth, combining rugged construction with mission-ready features straight from the factory.

At the heart of this upper is a 14.5″ M4 profile barrel paired with the iconic Daniel Defense RIS II Picatinny quad rail in FDE—one of the most battle-proven handguard systems ever fielded. A Mil-Spec F-Marked Front Sight Base provides reliable iron sight capability, while the A1.5 Fixed Rear Sight offers a solid, no-snag backup option. The Surefire SF3P flash hider doubles as a suppressor adapter, making suppressor integration straightforward for qualified buyers. An M16 profile full-auto bolt carrier group ensures smooth, reliable cycling, and the included Rail Mounted QD Swivel Attachment Point with QD swivel adds sling-ready versatility right out of the box.

Whether you’re building a SOPMOD-inspired collection piece, upgrading your current lower, or outfitting a duty-ready rifle, this Daniel Defense upper sets the standard. Deep Roots Rifle Co carries a strong selection of Daniel Defense products with competitive pricing and fast shipping nationwide. Stop by our Eustis, Florida gun store for hands-on assistance, or order online today at deeprootsrifleco.com.