Daniel Defense DD M4A1 FSP RIS II complete upper receiver built for 5.56mm NATO. This 14.5in configuration is permanently pinned to an overall 16in length and features a carbine-length gas system with an F-marked front sight base. The handguard is the Daniel Defense M4A1 FSP Rail Interface System (RIS) II for a rigid, precise fit, and it ships with an M16-profile bolt carrier group and an A1.5 fixed rear sight.

Key features

• Complete DD M4A1 upper receiver configuration in Flat Dark Earth with matching RIS II handguard
• 14.5in chrome-lined, cold hammer forged barrel with 1:7 twist and M4 profile
• Carbine-length direct impingement gas system with F-marked front sight base
• M4A1 FSP Rail Interface System (RIS) II CNC machined from 6061-T6 aluminum with Type III hard coat anodizing
• Surefire SF3P flash hider / suppressor adapter pinned and welded with black Ionbond DLC coating
• Mil-Spec receiver with indexing marks and M4 feed ramps and an M16-profile MP-tested bolt carrier group

A ready-to-run Daniel Defense M4A1 upper built with mil-spec materials and attention to alignment and staking.