The DonnyFL Quick Disconnect Rear Cap Adapter comes with both pieces 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 pick the correct thread for the barrel adapter that threads onto the end of your rifle's barrel/shroud.