In 2009, Ruger released the SR-22 Rifle model, a 10/22 receiver embedded in a chassis that mimics the dimensions of an AR-15 style rifle such as their own SR-556. The SR-22 Rifle uses standard 10/22 rotary magazines, in addition to most aftermarket 10/22 magazines.[12] The positions of the magazine release, the safety and the charging handle are all more similar to a standard 10/22 than an AR-15. The SR-22 Rifle competes directly with other AR-15 style rimfire rifles such as those made by Colt and Smith & Wesson. The SR-22 rifle boasts an aluminium handguard, adjustable six position stock, and a top receiver rail. Threaded holes on the handguard provide the customization of optional attachment rails.