Introducing the robust and reliable heavy-duty 3 lug adapter a new quick-attach mounting solution engineered to enhance the durability and lifespan of your 3 lug equipped firearm. Crafted from tough 17-4 stainless steel, this fully enclosed assembly ensures exceptional strength, making it well suited for heavy usage, even in full auto scenarios. The HD 3 lug adapter seamlessly integrates with the hub system and employs the renowned HK tri-lug interface, offering versatility by replacing any 1-3/8-24 mount. Designed to fit R9 and Nitro N20 sound suppressors, with potential use on select rifle calibers, this adapter serves as an ideal upgrade for those seeking a robust quick-attach mount especially in demanding full auto environments.