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Discussion Starter · #1 ·
Springfield XD40 magazines work in the 9mm pistol with very minor tweaking. Will the .40s&w P99 magazines work with the 9mm P99 and if so, how many rounds of 9mm would the 10round .40 magazines hold?

Are the SW99 magazines compatible with the P99?
 

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Discussion Starter · #4 ·
For P99 mags, the feed lips are (w/o alteration) too wide on a .40 S&W mag to retain 9mm rounds. I vaguely recall someone trying this and being unsuccessful. That said, if this is being asked to find a way around state laws regarding capacity limits I suggest using caution here. The authorities probably will not be amused if you cram 11 or more rounds of 9mm in a 10 round .40 S&W mag. -Be careful.
We have this debate quite often on a CA based forum with input from lawyers. It sucks that we have to play this game but that is exactly what the CA DOJ does, play word games with the penal codes or ever worse make up fudd and spread it to our local PDs.

The PC specifically states that one can't 'sell, import, or manufacture' a hi-cap magazine. Seems they left out buy but that is up for the DA to decide. An interesting thing is certain exemptions exists for this 'sell, import, and manufacture' such as for LEOs or armored vehicle guards. So, in theory, since LEOs and others are exempt from the PC restricting 'sell, import, manufacture' and because the PC does not specifically state that one can't "buy" then an LEO should be able to sell to a regular Joe. Of course this doesn't happen though.

The thing about sticking 9mm rounds into the .40s&w magazine falls into whether or not a person is manufacturing a hi-cap magazine and in this case a person would not be. The original magazine and design is still in place and still usable in the .40s&w P99. Of course this is all just word games and jail time isn't worth it. No need for more good people to be labeled a criminal.
 
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