Rugged Suppressors 3-Lug Mount 45 ACP. This mount is designed to be internal so that your overall firearm length is as short as possible. Using a 3 Lug Mount allows you to quickly attach/detach your suppressor to fixed barrel firearms without having to worry about suppressor walk-off. Specifications for Rugged Suppressors .45 ACP 3-Lug Mount: Manufacturer: Rugged Suppressors Weight: 1 lb Package Contents: Rugged Suppressors .45 ACP 3-Lug Mount Rugged Suppressors OA007: 3-Lug Mount 45 ACP