Will a hk usp compact 357 sig mag work with 40 S&w ammo? I have a 40 cal usp compact and can get a good deal on some 357 sig mags if they will work.
My understanding is that they are the same. I used 357 mags in my compact 40 without any issue.
USPC .40 and .357 SIG mags are exactly the same. Use either interchangeably with complete confidence.
Originally Posted By dog44:
Will a hk usp compact 357 sig mag work with 40 S&w ammo? I have a 40 cal usp compact and can get a good deal on some 357 sig mags if they will work.
They will work flawlessly.
Now all you need is a 357Sig barrel.
I shoot 357Sig in my 40 compact magazines and haven't had any problems at all.

Thanks guys.