so i just got this one called Rain Buddy, only 2 oz, for all you ounce counting mountain hunters or anyone else looking for simple sock for your gun that weighs nothing...this one happens to be waterproof, then take a peak,
i got the regular rifle one for my cz 527 with 24" barrel which is 42.75" long and has a 30mm tube leupold mounted in medium rings and it's an ideal fit, i believe they list at 45" long
and true advertizing, it weighs exactly 2 oz on my scale, should ride nicely in the kifaru gun bearer for going through parks etc. or however you wanna strap it on the pack or even stuff it in the pack
https://www.waterproofguncovers.com/
took a couple weeks to show in mail, great product