can anyone tell me what is used for the barrel ends in this picture? are they some kind of connector, or are these part of a mold the creator has? just curious, i want to make my own barrel for my modified sidearm, and would like to use these if i can find them at a hardware store or something...thanks!
![ESBSA10.jpg](http://webpages.charter.net/skdmark/ESBSA10.jpg)