Let me start by saying I don't know if this is possible. Some time back there was a lot of interest in getting Bar-Sto to make 40 S&W barrels to fit the 1006, but due to not enough demand, it was not done. The folks interested in this were mostly 1006 users and I think if the 40 barrel could be swapped out, it would have been done. BarSto had previously made the 40 S&W conversions for the 1006, but stopped due to demand drying up. I have the 1006 and a 4026, but the barrel length of the 4026 is too short for the 1006, so testing is not feasible for me. The 40 S&W will work in the 10mm mags - that much I know, although all this does not exactly answer your question. Good Luck.