Originally posted by Pacifist_Farmer
First things first. If you live in MA you are prohibited from posessing a magazine with a capacity over 10 rounds that was manufactured after Sept 1994. So buying a new high-cap mag for an XD is out. I can only guess that the reason that you are asking about modifying Beretta mags is b/c you have an idea where you can get pre-ban ones.

I have heard there are 2 ways to get hi-cap mags for XD's without buying an actual XD hi-cap mag:
1 - Take a standard cap .40 caliber mag, modify it slightly and it will fit 15 9mm rds. This is all well and good, but you gotta know exactly how to modify the mag. Also your witness holes won't line up properly. But the real catch is that this may run afoul of the Mass law about magazine capacity even if the original mag is for a .40 and is legal. Since OEM XD mags didn't exist in 1994, once you modify it for high-cap you are probably breaking the law.
2 - Find a pre-ban high cap Beretta 92 (or SIG, CZ, etc) 9mm mag and modify it for use in the XD. I have read this is very easy to do and simply invovles cutting a notch in the mag to line up with the mag release on the XD. Again I'm not 100% sure where this falls legally. To be safe I wouldn't use ANY high cap magazine made after Sept 1994.
I'd link you to the sites for doing these mods buuut a little research and you will find them easily on your own.
As an aside, if you plan on using this gun for CC my advice would be to keep the high-caps strictly for the range. Why? B/c MA is very anti-2A and if you make defensive use of you your pistol with a high-cap magazines a PA will have a field day with you. I know it sucks, but its the world we live in today.
Stay safe!



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