9mm to 40? WITH A BARREL CHANGE?

kayak45 · January 7, 2011, 10:19 PM

] I saw today in another forum a report on changing a S&W M&P from a forty to a 9MM by changing barrels and mags???? Said it worked great and will save money on ammo.

Can an XD 9 change into a 40 w/barrel and mag conversion? Seem to be same platform?

oldcspsarge · January 7, 2011, 10:38 PM

same platform but breach face of the slide cut for 9mm will NEVER fit a 40 S&W case....sorry !

It's too big !!!!!!!!!!!

kayak45 · January 7, 2011, 10:50 PM

Sooo!. You can use a smaller ammo taking a 40 to a 9 but can't go up from a 9 to a forty. Right???

joegator · January 8, 2011, 12:53 AM

In most cases you can't go up from a 9mm. Most common swap is from .40 to .357 sig.

mete · January 8, 2011, 02:59 AM

Some have made the change but leave out the word 'reliable' !!

Bore , chamber, extractor, ejector and magazine all are different .

ripnbst · January 8, 2011, 03:03 AM

40>9 but not 9>40, correct.

WeedWacker · January 9, 2011, 08:31 AM

.357 = .40 case necked to 9mm

9mm slug and .40 rim. With a .357 Sig chambered barrel you can reliably change from a .40 S&W to a more expensive .357 SIG. With the 9mm barrel as others have said the rim on the casing is smaller and the extractor will have some issues snagging that rim. (you might need a lighter spring, too)

Mobuck · January 10, 2011, 09:01 AM

There was an attempt to make this work years ago before the 40 s&w. I think it was called 40 AE using a case similar to the 40 s&w with a rebated 9mm rim. I've seen Browning HP types with both barrels/mags. A great idea that came before it's time. My recollection on this is a little fuzzy.

goodspeed(TPF) · January 10, 2011, 05:11 PM

Quote:

I think it was called 40 AE

.41-AE.

January 7, 2011, 10:19 PM	#1
kayak45 Junior Member Join Date: December 13, 2010 Location: central illinois Posts: 12	9mm to 40? WITH A BARREL CHANGE? ] I saw today in another forum a report on changing a S&W M&P from a forty to a 9MM by changing barrels and mags???? Said it worked great and will save money on ammo. Can an XD 9 change into a 40 w/barrel and mag conversion? Seem to be same platform?

January 8, 2011, 02:59 AM	#5
mete Senior Member Join Date: June 14, 2004 Location: NY State Posts: 6,575	Some have made the change but leave out the word 'reliable' !! Bore , chamber, extractor, ejector and magazine all are different . __________________ And Watson , bring your revolver !

January 9, 2011, 08:31 AM	#7
WeedWacker Senior Member Join Date: December 13, 2006 Location: Body: Clarkston, Washington. Soul: LaCrosse, Wisconsin Posts: 1,591	.357 = .40 case necked to 9mm 9mm slug and .40 rim. With a .357 Sig chambered barrel you can reliably change from a .40 S&W to a more expensive .357 SIG. With the 9mm barrel as others have said the rim on the casing is smaller and the extractor will have some issues snagging that rim. (you might need a lighter spring, too) __________________ - Jon Disequilibrium facilitates accommodation. 9mm vs .45 ACP? The answer is .429

January 7, 2011, 10:38 PM	#2
oldcspsarge Senior Member Join Date: January 11, 2008 Location: Rocky Mountains Posts: 441	same platform but breach face of the slide cut for 9mm will NEVER fit a 40 S&W case....sorry ! It's too big !!!!!!!!!!!

January 7, 2011, 10:50 PM	#3
kayak45 Junior Member Join Date: December 13, 2010 Location: central illinois Posts: 12	Sooo!. You can use a smaller ammo taking a 40 to a 9 but can't go up from a 9 to a forty. Right???

January 8, 2011, 12:53 AM	#4
joegator Senior Member Join Date: April 11, 2008 Location: Florida Posts: 537	In most cases you can't go up from a 9mm. Most common swap is from .40 to .357 sig.

January 8, 2011, 03:03 AM	#6
ripnbst Senior Member Join Date: November 24, 2010 Location: Spring, TX Posts: 1,552	40>9 but not 9>40, correct.

January 10, 2011, 09:01 AM	#8
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	There was an attempt to make this work years ago before the 40 s&w. I think it was called 40 AE using a case similar to the 40 s&w with a rebated 9mm rim. I've seen Browning HP types with both barrels/mags. A great idea that came before it's time. My recollection on this is a little fuzzy.