Anyone know much about the registered bolts for the TEC-9 series of guns (KG-9/KG-99/TEC-9/DC-9/AB-10)? B&G plus another company made them. I'm wondering specifically how they work. Does the bolt itself simply replace the semi-auto bolt, nothing else in the host needs to be changed out, making the host a full auto only closed bolt affair? Or does the host need to be altered in any way, and if so, what alterations? I've searched high and low about this to no avail, lots of TEC-9 registered receivers out there, but they are apparently less desirable due to cracking, and the registered bolt is apparently the most desirable, but almost no information about them.
I suppose since B&G made the TEC-9 bolts, and they also made the UZI registered bolts, they probably work similar but I don't know how the UZI bolts work either. If somebody knows how those work, it would be enlightening--same question, with that registered bolt, what additional host alterations are necessary to get it working in an off-the-shelf semi-auto Vector (just as an example).