[1] The 522 fires .22 LR ammunition and serves as a training rifle for its larger counterparts due to mostly identical controls and features.

The SIG 522 Classic has a standard polymer handguard, M1913 Picatinny rail on top of the receiver, and folding and telescoping stock.

[3] SIG's 522 SWAT differs from the base classic model by adding a full length Picatinny quad rail forward stock.

The newest in the 522 lineup, the SIG Sauer 522 Target has an aluminum tube front end that is free floated from the barrel to increase accuracy.

It is equipped with a variable power scope mounted to the top Picatinny rail and a 508 mm (20 in) barrel.