SWD M11/9 SMG cracked upper I recently discovered a crack in the upper of my SWD M11/9. It is just below the ejection port, cracked completely, through and through. Can this be re-welded? Or just easier to buy a complete new barrelled upper? Is there a good source for OEM MAC, SWD, and/or Cobray parts? ....... specifically, a new barrelled upper for my SWD M11/9 SMG?