The DonnyFL Quick Disconnect Rear Cap Adapter is 1 part of 2 allows that allows you to convert your non-detachable DonnyFL moderators to the new quick disconnect system.

*This rear cap adapter is the piece that replaces the original moderator's threaded end cap. You must pick the correct adapter to match the DonnyFL moderator you will be converting. 

*You will also need to purchase the new matching DonnyFL Quick Disconnect Barrel Adapter that threads onto the end of your rifle's barrel. *You must have both the barrel adapter and end cap adapter to convert your moderator to the new quick detach style.