They make a great rifle horse scabbard that you can buy at agg stores like Murdoch's. I have been using them for years on my ATVs and P500. They are firm canvas over hardboard and the ends unzip. Waterproof and dustproof and have their own straps to tie them down. I tie one in front of my box and one behind it if I carry two rifles. You can see one mounted behind my box in my profile picture. They are expensive but worth it. The rifles pull straight out without any drag so are fast to get the rifle out.