M3bullet--I'm no tanning expert by any means but can relate a personal story that might help. There was a period toward the end of my IPSC competition days that I came home from a match pretty much knowing that due to starting a demanding new job my competitive days would be over for awhile. I had,to kill time waiting for the results to be posted,cleaned,oiled and stored my blue Commander in a Bianchi Askins Avenger.It made the trip home that way in a range bag,and sad to stay,that's where it was four years later when life settled down. Another Commander replaced it as a carry,and I always meant to get it out and store it properly,but did'nt. When my "priorities" got back in order I dug it out and was amazed when I really thought about it that there was no rust on the pistol.It HAD been oiled well...All of that said,with happy ending,I would not STORE a pistol in a holster as it seems a good place to aquire the tendency to rust. Sorry to hear that Bianchi has not answered...they used to be pretty good about that. Regards.