The SureFire SOCOM556-SB2 is based on the suppressor that won US Special Operations Command trials. Constructed of advanced high-temperature alloys and stainless steel with CNC laser welding. Redesigned internal venting reduces back pressure. Virtually eliminates first-round flash. Patented Fast-Attach design. Designed for shorter than 10-inch 5.56 systems or piston driven M4 platforms. Full-auto rated. Sub-1 MOA test-fired. Made in the USA. FDE finish. 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