AR15 Buffer tube threaded cap for storage

[Cue]

Hey everyone,

Does anyone know of a place to purchase those caps for ar15 buffer tubes that allow you to store the buffer in spring inside the tube? I have a couple of complete stock assemblies that are going back in to the safe without being installed on a receiver. In the past, I have received some stock assemblies that included the plastic cap but I threw them out thinking I would never need them. Well, now I do.

this is an example of what I am looking for from google.

 

[Gunbuffer]

If you have room for those in your safe you need more guns

 

[Cue]

If you have room for those in your safe you need more guns

LOL I do have 6 safes and about a dozen ar15s. I am patiently waiting for someone to make a folding receiver that folds to right instead of the left for my next ar15 build. Hell will probably freeze over first though.