I used the Kirst .22 unit in an Uberti 5.5" and gated it!
I'm a happy Kirst owner.
I did have an R&D cylinder which was fine, but I'm a Kirst guy all the way when it comes to conversion parts, as I wouldn't be happy with a conversion that wasn't gated.
I got a Kirst gated unit in .45 ACP for my Uberti with a 5.5" barrel. Cut the frame to accommodate the gate and added a Richard Mason ejector. Than I made the new look old with mustard, ketchup, vinegar, and salt. I stripped the handles and re stained them with ebony stain after I beat the wood like a disobedient woman, and than gave it some boiled linseed oil rubbing. Only kidding about the disobedient woman. Mine beats me on a regular basis, but I treat her real nice as long as she'll have me. Anyway, now it looks like something with history. Unless it's engraved with pearl grips, I prefer my Cowboy guns to look like Cowboys carried 'em. And maybe used 'em to hammer nails when he wasn't using it to hammer guys who needed a little hammerin'.
I know the .45 ACP isn't a real traditional chambering, but I chose that on Jay Strite's recommendation. Aside from being less expensive and easier to find than traditional Cowboy calibers, Jay told me that the .45 ACP is the most accurate caliber for his conversions with the Remington. Aside from being a heck of a nice guy he is also very knowledgeable, and probably knows what he's talking about when he makes a recommendation.
Anyway, once I had the initial conversion done, I just had to have the .22 unit to have the ultimate Cowboy plinker. I got the unit, antiques it and installed it. I just couldn't abide having to remove the cylinder to reload a piece I had done so much work to, so I cut the ring. It works out so that the cartridge rims are partially covered by the ring when it is uncocked, so no possibility of a shell falling out even if I'm hanging upside down! The ejector was almost there, but not quite. I just had to grind a little off the inside length to get it to work fine. Still plenty of thickness left on the rod, so it's not gonna' bend. If the ejector was positioned just a hair more away from the cylinder, it would have worked without the thinning of the rod. Someone with the ability could remove the rod housing from the cylinder pin, add a little extra material, and silver solder or weld it up and you would be good to go. Mine still works fine with ejecting the center fire cases, so I guess it would also work fine if you added some material like I described above. Overall, I love it. It's the ultimate Old West plinker, and I wouldn't trade it for a Ruger Single Six for anything. And that Uberti action is smooth as silk. If I can figure it out, I'll try to post some picks. Oh yeah. I got a Tripple K model 900 holster and gun belt from Cowboy and Shooter's Supply to carry it in, and it's a good fit for this gun as I have it set up. Bill from Cowboy and Shooter's Supply was very helpful and patient in working with me to make sure I got a holster that would work for me, and I'd say you couldn't go wrong dealing with them. And no. I don't have anything to do with that company, other than being a very satisfied customer. Happy trails, and keep yer powder dry!
Steve