All the best with the wedding. My only tip - pay attention to everything - the whole day goes by in a blur otherwise! Any way, getting married is the easy bit, it's BEING married that takes the work!
If it ever fails, heres a permanent solution, just fitted some today infact
https://www.google.co.uk/search?q=barrel+shims&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb&gfe_rd=cr&ei=DwESVMfBNeyI8Qe9h4HgAQ
Well apart from
The cut of the PC
The size difference
The harness
The plate bags
The internal cummerbund
The integrated mbitr pouches
The kangaroo pouch
The shoulder pads
The quick release system
The internal stkss system
The internal pads
The ability to zip on panels
They are pretty much the same