Rugged Suppressors Obsidian9 3-Lug Adapter | 13.5×1 LH

The Rugged Suppressors Obsidian9 3-Lug Adapter (OA004) provides a dedicated mounting solution for suppressors built to 9mm HK specification. It uses a 3-lug interface and 13.5×1 LH threads to secure compatible muzzle devices and mounts. The adapter includes a Go/No-Go gauge to help verify proper attachment and is documented as not compatible with .45 ACP.

Typical applications include range shooting for suppressed firearms and competition or training environments where a repeatable, regulated mounting interface is required. The adapter is also used in conjunction with OSS 3-lug mounts where compatible.

Product Specifications

• The manufacturer is Rugged Suppressors.
• The model is listed as the 3 Lug Adapter.
• The manufacturer part number is OA004.
• The UPC is 859383006716.
• The thread pattern is 13.5×1 LH tpi.
• The listed fit is 13.5X1 LH.
• The finish and color are Black.
• The overall dimensions are 1.55 x 1.45 x 2.50.
• The width is 1.4500.
• The height is 1.5500.
• The length is 2.5000.
• The weight is listed as 0.1.
• The country of origin is US.
• Compatibility is described as made to 9mm HK spec; not compatible with .45 ACP.
• Shipping restriction note on source material states NO DIRECT SHIP TO CALIFORNIA.

This adapter is a focused accessory for users who need a reliable 3-lug mounting interface for suppressors and related mounts built to 9mm HK specification. Its Go/No-Go gauge and explicit compatibility notes make it a practical choice for range use and competition or training where predictable, repeatable attachment is required.

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