The M4A1 RIII Upper Receiver Group is based Daniel Defense’s popular M4A1 platform, and offers multiple upgrades for greater performance and ease of use. It comes equipped with the exclusive RIS III rail system – an optimized version of the renowned RIS II rail that was developed by SOCOM. The RIS III rail system is lighter than the RIS II but still provides extreme durability, and multiple M-LOK attachment points allow for the installation of tactical lights/lasers, vertical grips, and other M-LOK compatible accessories. The RIS III incorporates the 6-Bolt, Bolt-Up system, an attachment that is strong enough to withstand the recoil from an M203 grenade launcher. Other features of the M4A1 RIII include a 14.5” barrel – the same barrel length as the U.S. Military’s M4 Rifle, but features a pinned and welded 1.5” flash hider for an overall barrel length of 16” to comply with NFA regulations. In addition, the M4A1 RIII Upper Receiver features a full-length flattop picatinny rail to install iron sights or an optic of choice.
Features of the M4A1 RIII Upper Receiver Group:
- Lightweight 12.5” RIS III rail with multiple M-LOK attachment points
- Full-length flattop picatinny rail
- 14.5” pinned and welded barrel