I've had both new and old Kiblers in my shop, they are the same. The lock is in my opinion a close copy of a Chambers but is all CNC fabricated, is that better? I don't know. I am a Chambers lock user for most all my builds, they function well, customer service is terrific and they are less expensive. Chambers kits allow you to build if thats important to you, Kibler kits allow you to assemble.
The guns that we emulate had locks that were all hand made, hand assembled and some are of a quality that are not capable of being copied today.
The end result with any of these kits is that you end up with a gun that you have sweat equity in.
Kevin