SIG SAUER Stock Mcx Mpx Sig Folding & Telescoping - STOCK-X-FOLD-TELE-FDE. For more great deals on AR15 Stocks by SIG SAUER please browse our Sig Sauer Gun Parts page. SIG SAUER Stock Mcx Mpx Sig Folding & Telescoping - STOCK-X-FOLD-TELE-FDE