GK

Thanks for the update... I contacted them a year or so ago about a rebore when I was looking to rebarrel the ZKK600, but they weren't keen even when the machine was actually in service

They said the Brno barrels were very 'stringy' with hard and soft spots that made the tool wander or gall in certain areas... "It will be pretty rough inside but will shoot OK" was their final word.

Sprinter may have made good barrels a few years ago, but everyone I know with experience of them avoid them.

TrueFlite in NZ will make up ZKK original barrel profiles apparently.

http://www.truefliteriflebarrels.co.nz/13544/index.html
http://www.truefliteriflebarrels.co.nz/13544/5139.html

One way to save costs on getting a ZKK rear sight base installed on a new barrel blank is simply to cut off the barrel at the rear sight boss and backbore it with a taper to match the new barrel, then part it off the barrel stub.

Sweat it onto the new barrel for a fraction of the cost of machining it integrally... be very difficult to pick if done carefully.

Cheers

TM