This is a hard-use silencer. Dead Air is not cutting costs or decreasing lifespan by using stainless steel baffles. They are not sacrificing durability in search of saving a few ounces. The Sierra-5 is full-auto rated with no barrel length restrictions. Love or hate the knurling its function over form directly inline with our goal when developing the Sierra-5. Built for professional use it offers the perfect balance of overall sound and flash suppression while maintaining a compact footprint and minimal weight. By utilizing HUB compatible (1.375-24) mounting adapters it can be configured to the end users specific needs. Featuring the proven winning combination of welded Stellite baffles wrapped in a stainless outer tube Sierra-5 is the last 5.56 suppressor youll need. The Sierra-5 Xeno includes a 1/2-28 Keymo flash hider and a Keymo adapter.