I've had these for over 18 years on two different ATV's. They might be old school, but all my buddys' newer high tech stuff works no better. They're easy on easy off, they're strong, they're simple, they won't mar your firearm's finish and they work.
https://www.allriteproducts.com/products/single-pack-rackI like the gun boots a lot, too. They offer outstanding protection, however, it's really tough to deploy your rifle if a fleeting opportunity arises.