This was a very short production run model and information is pretty scarce. This rifle uses a larger co2 bottle that hangs from the bottom of the rifle or possibly could be modified to accept modern available units. Please check out all of the pics as they are of the exact item you will receive. Stop by the store for more vintage sporting goods, knives, tools, wrist and pocket watches, aviation parts and many other hard to find items. The item "Vintage 1946 1950 Crosman Model 121 Repeater CO2 Air Rifle Hard To Find Nice" is in sale since Thursday, February 18, 2021.This item is in the category "Sporting Goods\Outdoor Sports\Air Guns & Slingshots\Air Rifles". The seller is "grammy_s" and is located in Blanchester, Ohio. This item can be shipped to United States.