The US Army Project Salvo Offset Clamp Style Feed Neck allows you to quickly remove and install your hopper without using any tools.  The Project Salvo Offset Clamp Style Feed Neck let you add attachment of the scope, mount and carry handle without using any offset mount or adapters. The best feature of the  Project Salvo Offset Clamp Style Feed Neck is it is made out of 100% metal - this will be the last hopper adapter you need to purchase - you will never break your feed neck again. Requires factory hook from the factory hopper adapter.