I have a stainless steel Ciener Platinum conversion unit that I purchased for my Colt 1911 and it works perfectly with my SR1911 and likes any high speed 22's, oth remington and CCI. Haven't seen any Ciener ads lately so I don't know if they're still in business. It appears that any 22 conversion unit that will work on a 1911 Colt or clone will work on a Ruger SR1911.