I received my 6 Suomi drums from Centerfire Systems today. Overall the finish isn't nearly as nice as the drums I bought from them a couple of years ago, but other than the outside finish wear, they should be completely serviceable and are free of any dents. One is near new and looks to have been inserted maybe once and another has a good size spot of rust on the front cover and drum body but it'll clean up. As is pretty typical with the M-31 drums, none have matching numbers but I was hoping based on my order a couple of years ago. My memory of the copious amounts of cosmoline and oil didn't fail me and these will need a good long cleaning. I tested the spring tension on four drums by winding them to the max. Two don't seem strong but the other two had the nice spring tension I remember. At $19.99 each plus $9.99 shipping and handling for all six drums, they're still a bargain.
I also received the three fifty round coffin mags I ordered. Ohio Ordnance advertises these as being in excellent condition and I wasn't disappointed. They have clearly been refinished, come wrapped in clear heat shrink packaging, and look nearly new. I really hated to pay fifty bucks each but after seeing these, I can easily recommend these if you're in the market for near new condition Suomi coffin mags. Here's a rare case of a surplus product looking much better than the web site's photos of the magazine. Fortunately I still had a coffin mag loader, (and you WILL need one for loading coffin mags), as Ohio Ordnance is selling these for $25.00 each.
Hope I didn't get too far off topic, but I know some folks were interested in the drums from Centerfire Systems. Here's the M-31 drum link but don't expect the outside finish to look anything like their photo.
http://www.centerfiresystems.com/M31DRUM.aspx