[doubs43]

Does anyone know if the 13 round 9mm SIG mags for a 229 will serve as a 12 round 40 cal. mag and work properly?

 

[Ko Improbable]

Does anyone know if the 13 round 9mm SIG mags for a 229 will serve as a 12 round 40 cal. mag and work properly?

They might work, but I wouldn't rely on them. The feed lips should be too close together for the .40 S&W to work right at all.

 

[rdunk]

doubs43 - from doing quite of bit of research on the p229 and 9mm, .40, and .357sig, it seems that all who have tried going the other way, that is,... using .40/.357sig mags for 9mm, ...have not had any problem. But as was said earlier, you may not be able to go with the 9mm mags for the .40/.357sig

I have a p229r with .40 and .357sig barrels, and I just received a 9mm Bar-sto conversion barrel, which did drop right in. While I haven't shot the 9mm barrel yet, I have put 14 9mm rounds in my 12 round .40/.357sig magazines. The "proof" will be in the shooting, but I am confident (based upon the experience of others) that these mags will work just fine for my 9mm rounds.

I did get the 9mm barrel for cheap(er) target practice. The .40/.357sig is for self defense!

Note - - I will assume you are not considering upgrading a 9mm p229 to .40cal?? I believe that is a no-no, and you probably know that already!

 

[rdunk]

doubs43, just FYI, I did receive a 14 round .40/.357sig mag for my p229r, and I have checked it out for the 9mm cartridge. The 14 round mag will hold 16 rounds of the 9mm.