In that "fire sale" I bought a CA89 SD pistol. As "Retro" said, the CA can is stainless steel. My CA SD can weighs a little over two lbs. RCM is going to be having a run of SD cans. I sent Mike at RCM my CA SD can. He said that the CA can was an exact copy of the cans that they used to make for CA, except that the RCM cans are made from aluminum instead of SS. Mike said that since the CA specs are the same, he could do an "upgrade" by changing the internals of the CA SD can with his aluminum SD internals. That would lighten the can by around 1 1/2 lbs. If your interested in an "upgrade" or an all aluminum SD can contact Mike at RCM. To me since I already have the SS CA SD can, the "upgrade" would be a lot less than a new RCM SD can.
I'm having Jeff build me a couple more SD pistols. HK Parts has a US made SD front end kit with a RCM SD barrel and trunnion. HK Parts also has a complete US made RCM SD bolt group for around $450. I already have some SW full size 9mm receivers, so add a mag catch assembly, rear sight, semi trigger group, and pistol end cap, Jeff can build a SD pistol. The RCM, CA, and HK factory use the same general specs for the barrels so both the CA and RCM SD cans will interchange. While it would be cool to use a factory SD parts set, at over $2,000 for a HK SD parts set, I'd rather use brand new US made parts. Unless I could see the HK parts set myself, I'd worry about getting a bulged barrel. Good luck with your SD pistol project.
Scott