Sig 551 / 552 / 553 / 5XX 4 Position Lower with Side Folding Stock. Includes four position trigger (s, 1, 2, 3, 20). Swiss made. These came from Police Trade in parts kits and will have scratches, dings and signs of use. All parts work perfectly. Sold as is, no returns/exchanges. All sales final! Please know your Local, State, and Federal laws before ordering. No sales to banned states. No sales at all to CA or WA. All NFA Laws Apply! Item pictured is of one you will receive.