Sig Sauer 22LR 522 Model w/Folding Stock Metal Receiver & Picatinny Rail The performance of the Sig556 but in an affordable 22 LR with the Sig 522 Semi-automatic rifle. Featuring a Swiss type folding stock and polymer forend on a durable metal receiver with integral picatinny rail, and a classic military style platform. •Action: Semi-Automatic …