Hi Hacksaw,

Your "gun within a gun" is an idea I have never heard of. I have heard of spare parts (e.g. firing pin, back-up sights) being stored within the butt of a rifle, and ammo or survival kits.

On the Henry US Survival Rifle it maybe possible to store a second receiver/barrel/magazine in the butt of an assembled rifle. The gun would be almost twice as heavy so the floating aspect would probably be lost.

Interesting concept, you are definitely "thinking outside of the cave".

Mike