I gotta agree with bubblerboy and Redtick12, Alkin is the way to go. I had a Omega super charger that I rebuilt once, it ran for 12 hours after the rebuild. I like shooting so much that I decided to bite the bullet and get the Alkin. The Omega was $1800, had to be rebuilt with less than 300 hours on it, and seized up 12 hours after the rebuild. The Alkin tops off a big bottle in minutes, first maintenance is after a 1000 hours if I remember right. Edit: There is maintenance before 1000 hours, I’m wrong about that sorry.
They are expensive at over $3000, but Alkin backs everything up and they are easy to get in contact with. But if a person doesn’t shoot every day a smaller compressor would be fine, heat is what breaks down the parts that you replace with a rebuild. So if you had a small compressor and used it to fill gun bottles it would probably not get very hot, but if you were topping off a big bottle and the compressor had to run for 30 minutes it will get really hot. I’ve heard of some really smart folks that have set up water cooling systems for the Yong Heng compressor and they have no problems with heat. I’m not crafty enough for that so I “cried once” and hopefully bought my last compressor lol! ‘Edit’… Holy cow, sorry I wrote a book!