I never got any replies to this post but I do have a follow up.
Beware of this company! I had an R&D conversion cylinder for an 1858 Remington that worked fine. The Colt conversions seem to be another story. I bought two, one for an 1860 Army and one for a Uberti 1851 navy. Both were too long and bound up when you put the barrel back on. Additionally, the 45 cylinder for the Army, was out of time and didn't turn far enough to engage the bolt slot. The maker (R&D) said they offered free fitting with about a 3 week turn around, so I sent them the 1860 Army and the cylinder. After 5 weeks I started trying to get ahold of someone there. I had two phone numbers, both went to voice mail and the voice mailbox was full, so could'nt leave a message. I tried again and again , always the same story. I called the Beloit, WI. PO to see if they were out of business or something, they told me everything appeared fine. Tried Beloit Chamber of Commerce (no help) and Wisconsin BBB.
After two months the pistol came back today. It was poorly packed in a beat to sh*t Priority mail box (new ones are free guys) with the end of the barrel resting unpadded against the end of the box. The grip was dented and scratched on one side. The conversion cylinder was installed. It now turned freely but was still out of time and doesn't lock up (engage the bolt slot). Furthermore, when I installed the factory C&B cylinder, it's now out of time and the pawl doesn't turn the cylinder most of the time. So I can't even shoot it C&B now, and this was one of my best pistols before this trip. So now I'll have to spend a bundle on a real gunsmith just to get my C&B back in order. The conversion cylinder is going back to Midway.
Oh, I had sent an e-mail to R&D and said I was on vacation the first week of June and was going to drive to Beloit to see what was going on. Never received a reply to that message either. I'd love to discuss this with them but since they don't answer their phone or emails, I guess I'll just have to rant here.