I bought a second hand Kibler kit in the box, the previous owner had taken it out of the box put the barrel in the channel and later removed the barrel the wrong way and cracked the stock which was easy to repair.
The kit had been set up for a long time, I had no way of knowing what kind of environment it had been in. When I ran a patch down the barrel it had a rust line on one side like moisture had accumulated in narrow spot the full length of the barrel. The rust was superficial, I scrubbed it out with a scotch bright patch. My thinking is the barrel should have had a coat of RIG in the barrel, it was a Rice barrel, perhaps it did and the first owner ran patch with some unknown substance on it down the barrel and removed it.
I ordered a Kibler lock that developed a rusty spot rather quickly on the back of the frizzen while I had it stored in my shop. Probably a spot that was missed when the exterior of the lock was lubed, the rest of the lock looked like a finely made Swiss lock, no rust or corrosion.
My point is; to be on the safe side go over all your gun parts and put some oil on them before you store your kit, run an oily patch down the bore, I use 30W motor oil. Don't take it for granted that all of the parts were perfectly protected prior to shipping, sometimes stuff gets missed.