Double feed Bolt Assembly for Mac-10 9mm SMG & OB-$158.98
http://usmachinegun.com/proddetail.php?prod=M10SMG-0105
Mac-10 9mm Barreled Upper-$109.98
http://usmachinegun.com/proddetail.php?prod=M10RP-0101
Mac-10 9mm Single Feed Bolt Assembly for SMG & OB-$158.98
http://usmachinegun.com/proddetail.php?prod=MD-123
More replacements parts available!
http://usmachinegun.com/products.php?cat=22
Please call with any questions. Have a great week!