I've had TK do three guns for me..3" 66-2, 3" 60-10 and a 649.

Because they are kind of rare I bought extra cylinders for the 66 and 60...got lucky and both dropped right in with no fitting. The 649 just had the original cylinder done.

All three guns shoot .38 Super and 9mm extremely well. TK advises not to shoot 9x23 in their conversions as the 55K psi factory loads are significantly higher than the 35K working pressure for .38 Super...

I love colt_saa's 627 9x23 and if I ever come across one at the right price would send it Pinnacle to be converted just like that one...

Bob