(NO SHOW) Rear Stock Adapter W/6 Position Adjustable Rear Stock for M-11 SMG 9mm-$149.99
http://usmachinegun.com/proddetail.php?prod=M11U-NS6P
M-11/ Master Piece Arms Mid sized 9mm Side Cocker Upper W 3/4x10 thread W/Adjustable sights-$234.99
http://usmachinegun.com/proddetail.php?prod=M11S-SCS
Galil Style Rear Stock with No Show Adapter for Mac-10 SMG-$148.98
http://usmachinegun.com/proddetail.php?prod=M10U-GLL
Modular Lite Rear Folding Stock and Adapter for MAC-10 .45 acp/9MM SMG-$259.99
http://usmachinegun.com/proddetail.php?prod=M1045-LRFS
AR Stock Adapter for M-11 Cobray Semi Auto-$68.98
http://usmachinegun.com/proddetail.php?prod=CSA-0109
AR Stock Adapter for Master Piece Arms .45acp-$59.99
http://usmachinegun.com/proddetail.php?prod=MPASA-0119
Forward Tri Rail Mount for M-11 Semi/SMG & MPA 9mm Semi Auto-$78.98
http://usmachinegun.com/proddetail.php?prod=M11SA-0117
MAC-10 SMG AR (comm or Mil Spec) Rear Stock Adapter- $59.99
http://usmachinegun.com/proddetail.php?prod=M10U-0102N
More stock options and other parts available. Please call or email with any questions. Have a great weekend!