Enhance your shooting precision and safety with the Rugged Suppressors 3 Lug Adapter designed with a 5/8-24 thread pattern. This adapter features the patented GoNo Go Gauge ensuring your suppressor is securely attached for worry-free operation. Tailored to 9mm HK specifications it pairs seamlessly with OSS's 3 Lug Mount. Please note it is not compatible with 45ACP making it a specialized choice for those seeking reliability and precision in their firearm accessories.