Dead Air Xeno Zero Mount .38 Cal. .500-28Dead Air Xeno Zero Mount . 38 Cal. . 500 28 Lightweight and minimalist threaded taper mount; Ensures repeatable accuracy and solid return to zero; Compatible with Xeno Adapters and suppressors like Sierra 5, Nomad series (with Xeno adapter), Primal, Wolfman, Ghost 45, and Wolverine (with HUB adapter); Bore size fits . 458 caliber or smaller (most variants) and 9mm (specific thread pitches); Constructed from 4140 HT alloy steel for durability; Black