The first model lasted only 2 years, 1876 and 1877. The improved second model uses the cam style extractor system (much less expensive to produce) than the scaled down Russian ratchet extractor system. Total production for the first model numbers 25,548. The second model produced from 1877-1891 went to 108,255 total manufactured. There was also a third model (Model of 1891) sans the spur trigger for a real trigger guard. Some even came with a single shot target barrel. I cobbled together an imaginary 1881 single shot target model with 8" .22lr barrel from my second model single action parts box.