.40 cal to 9mm magazine conversion - XDTalk Forums - Your HS2000/SA-XD Information Source!

02-15-2005, 11:35 AM

Sorry for asking what may have been asked a million times, but I only have short periods of time that I can search at work.

Where can I find documentation on modifying .40 cal mags to hold 9mm ammo? I'm planning on buying a 9mm conversion barrel and I'd like to mod a couple of my .40 cal mags. I thought AJames had some info with pics, but I haven't found it. I seem to remember pics that showed how low the 9mm round should sit to prevent lockback on the next to last round. I did a quick search only to find folks saying you should bend the lips in a bit...

Can someone point me in the right direction

aiformula · 02-15-2005, 12:20 PM

before the hack there was a post about it w/ pics and everything. I believe they were talking about pinching the upper retention lips down just about .015". Fwiw, I use my 40 mags unaltered in my 9 all the time.

c22m22c · 02-15-2005, 04:20 PM

happen to remember how many rounds of 9mm you can fit into a "hi-cap" .40 cal mag?

mattsnuked · 02-15-2005, 04:36 PM

My .40 mags work good left alone but sometimes the slide will lock back on the last round.

The 10 round .40 mags will hold 15 so I think that the standard cap mags will hold 17-18, but I have not tried yet.

CahillXD · 02-15-2005, 05:51 PM

Look in the FAQ thread and I think it tells you what to do.

Chris Cahill

02-15-2005, 07:11 PM

Thanks CahillXD!!!

The first time I looked at that page...I only saw the "sub mags" part and moved on. It was there all along.

02-15-2005, 11:35 AM	#1
Wulfen59 Guest Posts: n/a	.40 cal to 9mm magazine conversion Sorry for asking what may have been asked a million times, but I only have short periods of time that I can search at work. Where can I find documentation on modifying .40 cal mags to hold 9mm ammo? I'm planning on buying a 9mm conversion barrel and I'd like to mod a couple of my .40 cal mags. I thought AJames had some info with pics, but I haven't found it. I seem to remember pics that showed how low the 9mm round should sit to prevent lockback on the next to last round. I did a quick search only to find folks saying you should bend the lips in a bit... Can someone point me in the right direction

02-15-2005, 12:20 PM	#2
aiformula XDTalk 3K Member Join Date: Oct 2004 Location: sw ohio Posts: 3,086	before the hack there was a post about it w/ pics and everything. I believe they were talking about pinching the upper retention lips down just about .015". Fwiw, I use my 40 mags unaltered in my 9 all the time. __________________ Tony Obama '08... change we can bereave in. Guns are like orgasms.......you just can't have enough good ones!

02-15-2005, 04:20 PM	#3
c22m22c XDTalk 500 Member Join Date: Dec 2004 Location: east coast Posts: 582	happen to remember how many rounds of 9mm you can fit into a "hi-cap" .40 cal mag? __________________ HK USP 9mm Fullsize HK USP 9mm Compact Springfield XD9 4\" and assorted other goodies.

02-15-2005, 05:51 PM	#5
CahillXD XDTalk Member Join Date: Jan 2005 Posts: 42	On this page... Look in the FAQ thread and I think it tells you what to do. Chris Cahill __________________ Walther P99 XD-9 Sub OD frame

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02-15-2005, 04:36 PM	#4
mattsnuked XDTalk 100 Member Join Date: Nov 2003 Location: Phoenix Posts: 233	My .40 mags work good left alone but sometimes the slide will lock back on the last round. The 10 round .40 mags will hold 15 so I think that the standard cap mags will hold 17-18, but I have not tried yet.

02-15-2005, 07:11 PM	#6
Wulfen59 Guest Posts: n/a	Thanks CahillXD!!! The first time I looked at that page...I only saw the "sub mags" part and moved on. It was there all along.