The sizes it can use are 1/2, 5/8, 3/4, 7/8, 1'. All 23 gauge.
No, but you can use several lengths depending on your project.
If the tool is brand new if would be covered under warranty. We just need a copy of your receipt. Please give our customer service line a call at 888-669-5672. Thanks.
1 Year Limited Warranty against manufacturers defects. The sales page has a warranty tab with all the details. You can contact us directly if you have any issues: 1-888-623-5966
If you air line doesn't have an auto oiler on it, just add a drop or two in the rear where the air line goes in every time you use it. It comes with a little bottle of oil.
It is 6-3/4 inches from the bottom of the tip to the top of the head.
Upside down, with pin arrow facing away from the gun.