Do you need a gun cabinet for an air gun?

It's not necessary but it doesn't hurt. If you don't want anyone else to accesses it, then a locking gun cabinet will secure your gun. I own over 50 different air guns, Not Air-soft guns but air guns and rifles. Some of them are capable of firing a 45 caliber pellet at over 800 feet per second. Some of them are very expensive. So I own several gun safes to store them. When it comes to guns, safety is always first.