October Country carries a nipple and cap over so a rifle or single shot pistol can be safely carried with a cap on the nipple. Comes with an o-ring so it is water resistant as well.Don’t remember where I got it but about 25 years ago I bought a machined brass nipple cover with an O ring inside and a hole for a leather thong through the top. The O ring keeps it from falling off and keeps water out as well. Lower the hammer on the cover and just give it a quick tug on the thong after you cock the hammer and it falls to the side and you’re good to go. One of the more simple and efficient tools I’ve seen.