The ARC (Advanced Reliability Combat) Magazine from TangoDown is a polymer magazine designed for the SCAR, M4-series of 5.56x45mm weapons with true 30-round capacity.
The ARC was originally designed for the FN SCAR-Light, but will also fit the M16/M4/AR-series of rifles, plus the M-249 weapon system. Two versions are available; one aimed at the military user and a commercial variant for all other users. The difference between them is the presence of a ridge/lip around the magazine body with a soft die-cut ‘gasket’ that seals against the magazine well on the military model; the ‘sand seal’, preventing sand and debris from entering via the mag well. The ARC/L-001 is the military model and the ARC/L-001C is the commercial model, without the seal.