I have for quite some time wanted to build a 6mm-06ai. There is a 110 243 at one of my local gun shops. It has the 5.062 screw placing. I've read that the magazine port would have to be lengthened for an 06 length cartridge. What i'm wondering is how costly that would be and who could i get to do it. I also would like to know if the chamber can be lengthened to 6mm-06ai by hand or would it have to be done on a lathe? As I would like to do as much of the work myself as possible (for the experience) Thanks in advance for any input.