Daniel Defense M4A1 5.56 NATO AR Rifle, FDE RIS II Rail

Description

The Daniel Defense M4A1 with FDE RIS II rail is built around the same specification that US Special Operations Command adopted for the SOPMOD Block II program in 2005, making it a direct-pattern military carbine in a semi-automatic configuration. It suits the shooter who wants a purpose-built duty rifle rather than a sporting approximation of one.

The cold hammer forging process used on the barrel compresses the steel as it shapes it, resulting in a denser grain structure that holds its dimensions under sustained heat better than cut-rifled alternatives. Chrome lining inside the bore and chamber adds corrosion resistance and simplifies cleaning after extended range sessions. The 1-in-7-inch twist rate is optimized for heavier projectiles in the 62- to 77-grain range, stabilizing them fully — shooters running 55-grain loads will find they still function reliably, though the twist is not tuned for that end of the weight spectrum.

The carbine-length direct-impingement gas system returns more energy to the bolt at a sharper pressure curve than a mid-length setup would, which is a trade-off inherent to the 14.5-inch barrel length. A heavier H buffer is fitted from the factory to absorb that additional bolt velocity and moderate felt recoil accordingly. The RIS II handguard is a full Picatinny quad-rail platform, giving the shooter four continuous rail surfaces to mount lights, lasers, grips, or other accessories without adapters. No sights are included, which keeps the top rail open for whatever optic or sight system the shooter intends to run. The lower receiver is machined from 7075-T6 aluminum with a flared magazine well and a rear QD swivel attachment point built in. It ships with one Magpul PMAG.

Shipping and availability: This item must ship to a licensed FFL dealer for transfer.