The Barrett MRAD / MK 22 / MRAD‑SMR 10‑round "B" Stainless‑Spring Magazine Assembly is a detachable box magazine engineered for rifles using the MRAD‑series "B‑type" magazine interface. Designed to accommodate cartridges such as .300 PRC, .300 Winchester, and 7mm PRC, this magazine features a stainless‑steel spring to ensure consistent feeding and reliable performance. With a 10‑round capacity, the magazine offers standard operational capacity suitable for precision rifle builds. Intended for use with MRAD-family rifles configured for the specified calibers, this magazine assembly serves as a durable, drop-in‑style feeding component for shooters seeking a dedicated magazine for those chamberings.