The .45ACP 3 Lug Adapter features our patented Go/No Go Gauge. The No Go/Go Gauge provides confirmation that your suppressor is properly attached, for a surprise-free shooting experience. This 3 Lug Adapter is compatible and used in conjunction with the Rugged Suppressors .45 ACP 3 Lug Mount. Available Thread Pitch Options:5/8x249/16x24.578x2811/16x24 Rugged Suppressors Obsidian45 5/8x24 3-Lug Adapter OA008