Refine Your Roller Locker. The stainless-steel SFA(R) Ryder 9-MP5 is a duty-use suppressor designed for the H&K MP5 submachine gun. It attaches to any standard tri-lug barrel (and Navy barrels) via a proprietary Fast-AttachA(R) system similar to what you'll find on our legendary SOCOM suppressors. Extremely durable and highly effective at attenuating noise, its stainless steel baffles while its built-in spacers help prevent excessive carbon buildup. The SF Ryder 9-MP5 is easily disassembled for cleaning, and its baffles are indexed and numbered for easy reassembly. Unlike other sub-machine gun suppressors, it does not affect bullet performance or increase point of impact/point Mfg: Surefire