Zenitco announced on Facebook the PR-1 Cap for 24mm AK Threads for easier maintenance for AK users... "Introducing a small, yet convenient tool to have for regular rifle maintenance. The PR-1 cap attaches to any 24mm AK thread on one side, and the other accepts any standard plastic bottle-neck. This cap simplifies cleaning and has been called an invaluable tool by customers for those that do not have a separate workspace or perform weapon maintenance at home.