I confirm Bare Knuckle Vacuum 3.1 its working fine in my GCW Zero unit with the latest release candidate Openbor Opk.I cant test Bare Knuckle Vacuum 4.1 or 4.0 because i cant find it.Im download many paks to test it in my gcw zero and show for everyone the new changes of the OpenBor Opk.Expect my video tonight beetween 9:00 pm and 10:00 pm (Hour Zone time M?xico)