After reading the excellent thread by mick regarding the rebuilding of an SMK B2, I thought I may have a try at altering the transfer port diameter.
I have a couple of questions.



Would it be better to sleeve the whole length of the transfer port as in diagram A?

Would there be any benefit in tapering the opening with a centre drill as in B?

Would it be better reducing the length of the sleeve to 16mm like some of the other rifles as in C?

Your thoughts