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 **** 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.