Rugged Obsidian 3 Lug Mount

The Rugged Obsidian 3 Lug Mount transforms how shooters run their Obsidian 9 and Obsidian 45 suppressors on fixed-barrel hosts. Built for HK-specification 9mm tri lug firearms, this mount replaces the standard piston assembly entirely, converting your suppressor to a twist-on quick-detach configuration. Shooters running multiple pistol-caliber carbines or subguns benefit from tool-free swaps that take seconds rather than minutes. The internal mount design keeps overall firearm length to a minimum compared to external adapter systems, making it a practical choice for compact firearms where every inch matters.

Rugged Suppressors engineered this mount with a positive-locking interface that prevents suppressor walk-off during sustained fire. The steel construction handles the thermal and mechanical stresses of suppressed shooting without compromise. Installation requires no tools—the mount replaces your existing piston, retaining cap, and spring assembly as a complete unit. Dimensions measure 1.55 x 1.40 x 2.60 inches with a weight of 0.2 pounds, adding minimal mass to your suppressor system. This 9mm variant (OA001) fits standard HK-spec tri lug barrels found on MP5 clones, Stribog, and other popular PCCs. Note that this mount is not compatible with traditional 45 ACP tri lug configurations—Rugged offers a separate OA007 variant for those applications.

Owners of multiple tri lug hosts will find the Obsidian 3 Lug Mount earns its place in their shooting accessories collection. Whether transitioning between a suppressed MP5 and a braced pistol-caliber build at the range, or simply preferring faster attachment than direct-thread methods allow, this mount delivers repeatable lockup without tools or timing adjustments. Made in the United States, it reflects Rugged's commitment to accessories that match their suppressor quality. We stock this alongside other suppressor mounting solutions for shooters building out their NFA inventory.