[Brotherbadger]

Honestly, you are going to be hard pressed to find any kind of rifle that fits in your bag without breaking it down. Have you thought about adding a Rifle Scabbard to attach to your bag? That way the gun remains out of sight and you don't have to break it down. It adds a bit of weight, but it frees up a bit of space within the bag while allowing you to carry almost any rifle easily. I am personally a fan of the Ruger 10/22 for a bug out gun. It's relatively light, well made and easy to shoot.