The GSG 1911 is my favorite .22 plinker. The GSG weighs in at about the same weight as a standard 1911 .45 ACP. Most 1911 add on parts fit the GSG grips, mag wells sights etc. They have a steel mag that is great compared to many of the new plastic mags. They fit the Black Hawk 1911 holsters and others. They are not Aluminum but some form of zinc casting. They are all so sold as SIG 1911 .22s.