The CG80 addressed the left hand problem with a bolt handle bent up & swept back , so the lefty could reach over the rifle & grab the bolt a little easier than a straight bolt . However , no such feature on the CG63's . Numrich has the left type bolts for a CG80 , which can be used on the CG63 , if you want to swap out the bolt . Lothar-Walther has CG63 barrels with the same profile as original CG barrels . At least that is what I have heard . The CG63 barrel is 29" long and the rear is 28m/m ( 1.102" ) in diameter . CG80 barrels are 32m/m ( about 1.250" ) at the rear , but L-W does not make them . I do not know if the L-W barrels are short chambered for finish reaming after the barrel is installed ? I suspect you can replace the barrel if you know what you are doing ? I don't know that a Midway barrel vise would fit the CG63 barrel , at 28m/m ?????????