'74 K10 Needs A Gun Rack

[Karnage]

But here's the catch, it can't be for the back windshield since I'd like to be able to open it up when I want without the rack/firearm being in the way.



The gun in question being my 41 inch long Mossberg 500 12 gauge pump action shotgun.



Anyone know of any other ways to hold it ready in the cab? Also, not be behind the seats... Otherwise I'd just put it in the case which defeats the purpose of it being on the rack, ready to go.