Siege ROC556 (Black). 5.56 suppressor based on a Linear Diffuser Array that redirects propellant gases radially through turbulent and laminar flow cells. Significantly reduces back pressure, sound, and flash without excessive blowback. Monolithic construction with contiguous bore provides extreme durability and erosion resistance — no angular baffles to erode over time. Made in Oregon. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor