The Ruger 10/22 is a series of semi-automatic rifles produced by American firearm manufacturer Sturm, Ruger & Co., chambered for the .22 Long Rifle rimfire cartridge. It uses a patented 10-round rotary magazine, though higher capacity box magazines are also available. The standard carbine version of the Ruger 10/22 has been in production continuously since 1964, making it one of the most successful rimfire rifle designs in history, with numerous third party manufacturers making parts and accessories for upgrading and customization. The 10/22's aftermarket is so prolific that a complete 10/22 can be built without using any Ruger-made components. A magnum version of the 10/22, known as the 10/22 Magnum, chambered for the .22 WMR cartridge, was made from 1998 to 2006. A .17 HMR version, the 10/17, was announced in 2004, but was only listed in the catalog for two years. Uses and customization The 10/22 is popular for small-game hunters and those who want an inexpensive rifle for firing inexpensive ammunition for target and plinking use. This popularity has led to many after-market modifications being available to improve performance, augment the rifle's looks, or increase its magazine capacity, making the 10/22 one of the most customizable firearms ever made. Custom manufacturers also make "clones" of the 10/22, which are similar in design (most parts will interchange) but built to much higher specifications and costs. The 10/22 barrel uses a unique two-screw, V-block system to attach the barrel to the receiver, allowing for removal or replacement of the barrel, which would ordinarily require the work of a gunsmith. Variations The 10/22 is available in a wide variety of configurations. In 2015, the Ruger 10/22 came in 11 different models, not counting distributor exclusives. The Carbine came in three models; the Tactical, Takedown and Target each had two models; the Sporter and Compact each had one model. The discontinued 10/22 International model was fitted with a Mannlicher stock. Standard barrel lengths are 20" in the 10/22 Rifle, 18" in the 10/22 Carbine, and 16" in the 10/22 Compact Rifle which is also fitted with a shorter stock. All .22 Long Rifle versions use an aluminum receiver, while the discontinued .22 Magnum version used a steel receiver with integral scope bases. 10/22 Carbine Standard model with 18.5" barrel. Offered with hardwood or black synthetic stocks, black alloy, or stainless steel receivers and a model fitted with LaserMax laser sight. 10/22 Target