M4A1 RII Quadrail PINNED MAG

The Daniel Defense M4A1 with RIS II rail system is the rifle that U.S. Special Operations Command chose for the SOPMOD Block II program, and Daniel Defense produces the civilian version to the same specifications. The 14.5-inch Chrome Moly Vanadium steel barrel is cold hammer-forged with a Government profile, chrome-lined bore and chamber, and a 1:7 right-hand twist, permanently attached to a Daniel Defense flash suppressor to reach legal overall barrel length. The RIS II (Rail Interface System II) quad-rail handguard is the original and definitive full-length 4-rail Picatinny system used by SOCOM since 2005, measuring 2.23 inches wide and 2.25 inches tall for maximum rigidity and accessory compatibility.

Receivers are CNC-machined 7075-T6 aluminum, Type III hard coat anodized, with an enhanced flared magwell on the lower and indexing marks plus M4 feed ramps on the upper. The ambidextrous GRIP-N-RIP charging handle and Daniel Defense buttstock and pistol grip complete the package. The M4A1 is not a clone of the military rifle -- it is the rifle that Daniel Defense builds for military contracts, offered to civilians with semi-automatic fire capability. For shooters who want the authentic SOCOM SOPMOD Block II configuration, this is the definitive choice.