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Posted: 12/23/2010 2:56:26 PM EDT
[Last Edit: 11/6/2011 12:39:20 PM EDT by Dog1]
Link Posted: 12/23/2010 3:12:59 PM EDT
http://www.ar15.com/forums/topic.html?b=5&f=16&t=101824
This is a post I had a few days ago. Same topic.
I did the same thing to my M&P 40c. I did all the measurements and then bought the 9c barrell from brownells as well. It doesn't work the other way around, though. You can't put a 40 barrell in a 9. Has to do with the ramping at the front of the chamber on the 40. I did have the 9 mags to test it and it ran without a hitch.
Link Posted: 12/23/2010 3:15:39 PM EDT
Link Posted: 12/23/2010 5:04:26 PM EDT
I don't feel that way at all. I just wanted you to know my experience. It's nice to have one weapon that can function as two.
Link Posted: 12/23/2010 5:30:31 PM EDT
Link Posted: 12/23/2010 6:17:24 PM EDT
Could you go the other way? .40 barrel in a 9mm slide, and frame?
Link Posted: 12/23/2010 6:36:19 PM EDT
Originally Posted By TEAMSHRALP:
Could you go the other way? .40 barrel in a 9mm slide, and frame?



Originally Posted By dirtyone04:
http://www.ar15.com/forums/topic.html?b=5&f=16&t=101824
This is a post I had a few days ago. Same topic.
I did the same thing to my M&P 40c. I did all the measurements and then bought the 9c barrell from brownells as well. It doesn't work the other way around, though. You can't put a 40 barrell in a 9. Has to do with the ramping at the front of the chamber on the 40. I did have the 9 mags to test it and it ran without a hitch.



He answered that here.

Link Posted: 12/23/2010 6:40:55 PM EDT
Link Posted: 12/23/2010 7:27:24 PM EDT
One of the best threads ever; it deserves a stcky for certain.
Link Posted: 12/24/2010 11:49:25 AM EDT
It has been my experience doing this that the width of the barrel hood is what mandates starting with a 40 or 357 and converting down to a smaller caliber. There can be a little lateral play and the gun can still shoot accurately.
Link Posted: 12/24/2010 12:40:05 PM EDT
Great thread.

I remember people doing this (40 ––> 9) with the SIG P229 when it came out several years ago.

This is the first I've seen on the topic for the M&P.



Link Posted: 12/24/2010 12:55:37 PM EDT
so i guess this means 40 = 9mm?

Link Posted: 12/24/2010 1:27:21 PM EDT
Link Posted: 12/24/2010 2:26:54 PM EDT
Dog1, are the ejectors the same for both .40 and 9mm? I ask because I know Glocks have different ejectors for each caliber. I was wondering if the Smiths differ, too.
Link Posted: 12/24/2010 2:35:53 PM EDT
[Last Edit: 12/24/2010 2:36:15 PM EDT by Dog1]
Link Posted: 12/24/2010 2:41:54 PM EDT
Thanks, man! I was thinking of selling my .40 and buying a 9mm (just for the lower price of ammo). Looks like all I need is a new barrel!

Does the 9mm use a different recoil spring, as well?
Link Posted: 12/24/2010 2:49:17 PM EDT
[Last Edit: 12/24/2010 2:49:29 PM EDT by Dog1]
Link Posted: 12/24/2010 2:58:14 PM EDT
Originally Posted By Dog1:
Originally Posted By badkarmaiii:
It has been my experience doing this that the width of the barrel hood is what mandates starting with a 40 or 357 and converting down to a smaller caliber. There can be a little lateral play and the gun can still shoot accurately.


This is true..I was looking at it again today. I was hoping that my mag from 44mag.com would get here today, but alas, it did not make it.

I got out my feeler gauges and checked the side-to-side of the 40 barrel then the 9 barrel, just cause I'm bored.

The gap between the barrels and the slide are the same.



What about the barrel hoods? They're the portions of the barrels that protrude to the rear and have the cutout so see if the chamber is loaded. It would be ideal if they're identical, but 9mm barrels usually have hoods about .5mm narrower.
Link Posted: 12/24/2010 3:03:12 PM EDT
Awesome, Dog1!

Looks like I can be shooting 9mm for about $80.
Link Posted: 12/24/2010 3:24:47 PM EDT
Originally Posted By ARJJ:
Awesome, Dog1!

Looks like I can be shooting 9mm for about $80.


Don't forget to pick up a few mags. I have the full size M&P 9 and the mags work fine. They just stick out a bit. I did pick up a few 9c mags from 44mag.com. One with the finger rest and one without. They had them the least expensive, but stock was low.
Link Posted: 12/24/2010 3:43:36 PM EDT
Originally Posted By dirtyone04:
Originally Posted By ARJJ:
Awesome, Dog1!

Looks like I can be shooting 9mm for about $80.


Don't forget to pick up a few mags. I have the full size M&P 9 and the mags work fine. They just stick out a bit. I did pick up a few 9c mags from 44mag.com. One with the finger rest and one without. They had them the least expensive, but stock was low.


That's the kicker––I already have half a dozen .40 mags, and M&P mags aren't exactly inexpensive. I think I'll look around on the EE.
Link Posted: 12/24/2010 3:53:49 PM EDT
Link Posted: 12/24/2010 3:54:37 PM EDT
[Last Edit: 12/24/2010 3:56:53 PM EDT by Dog1]
Link Posted: 12/24/2010 5:44:27 PM EDT
Thanks!
Link Posted: 12/24/2010 6:03:57 PM EDT
Link Posted: 12/24/2010 6:04:59 PM EDT
Thanks for the link Dog1!
Link Posted: 12/24/2010 6:12:50 PM EDT
Link Posted: 12/26/2010 12:03:44 AM EDT
So...does this also apply to the Pro (5") series? I am thinking of picking up a Pro, and if I can pick up a .40 and just swap out the barrel, then that would be awesome.
Link Posted: 12/26/2010 2:18:15 AM EDT
Whats the deal with your 9mm barrel behind the chamber/hood area.

It looks significantly different than the .40 barrel. Every single 9mm gun that i have looks like your .40 barrel, not the 9mm.

Very strange, did they just recently change the design?
Link Posted: 12/26/2010 9:47:50 AM EDT
Link Posted: 12/26/2010 9:49:22 AM EDT
[Last Edit: 12/26/2010 4:00:06 PM EDT by Dog1]
Link Posted: 12/26/2010 3:55:16 PM EDT
I got my 9mm barrel for my .40 for Christmas and had bought some 9mm mags a month ago. I had heard that the 9mm barrel would fit the .40 on other threads, so I am glad someone actually posted some good information. It might be a couple weeks but once I get out to the range I will let you guys know if I have any issues.
Link Posted: 12/26/2010 5:37:11 PM EDT
Originally Posted By jtl0101:
I got my 9mm barrel for my .40 for Christmas and had bought some 9mm mags a month ago. I had heard that the 9mm barrel would fit the .40 on other threads, so I am glad someone actually posted some good information. It might be a couple weeks but once I get out to the range I will let you guys know if I have any issues.


Please do! I'm seriously kicking around the idea, myself. For about $250, I can have the barrel, several 9mm mags, and a case or so of cheap blasting ammo. I've been thinking about trading my .40s for 9mms, anyway, solely due to ammo cost. I'm trying to get out and shoot more often (at least once if not twice a month), and I've found I can basically get 3 boxes of 9mm for the price of two boxes of .40. I also have a .45 M&P to feed, as well, and .45 has gotten outrageous.
Link Posted: 12/26/2010 6:31:17 PM EDT
Link Posted: 12/26/2010 7:23:48 PM EDT
[Last Edit: 12/26/2010 7:24:00 PM EDT by badkarmaiii]
I have a Pro Series 9mm. What do you guys want me to measure?
Link Posted: 12/26/2010 9:57:09 PM EDT
Originally Posted By Dog1:
Originally Posted By Magsz18:
Whats the deal with your 9mm barrel behind the chamber/hood area.

It looks significantly different than the .40 barrel. Every single 9mm gun that i have looks like your .40 barrel, not the 9mm.

Very strange, did they just recently change the design?


Are you referring to in front, at the milled flat spot?

Could be a design change.

It still locks up tight.


Im talking about the point right in front of the barrel hood facing the muzzle crown. That area is VASTLY different from my 9mm guns as my 9mm guns look like your .40 in that area.

WEIRD!
Link Posted: 12/26/2010 10:17:11 PM EDT
[Last Edit: 12/26/2010 10:21:39 PM EDT by Dog1]
Link Posted: 12/26/2010 10:33:55 PM EDT
[Last Edit: 12/26/2010 10:34:44 PM EDT by badkarmaiii]
My 9mm Pro Series, manufactured 11/11/2010, has that "thick spot" in front of the breech block...




ETA: Correct date.
Link Posted: 12/26/2010 10:37:45 PM EDT
Link Posted: 12/31/2010 3:40:50 PM EDT
I am posting my after action report of trying out my 9mm barrel in my .40 full size M&P.

I initially shot 30 rounds of .40 ammunition in my original barrel just to make sure the gun was operating properly. Next I changed out the barrel, dug through the bag, and realized I forgot my 9mm magazines at home. After some thought and remembering this thread, I decided to load up my .40 mags with 9mm ammunition and give it a try. I was pretty hesitant at first, but I manually cycled a mag through the gun and then decided to start shooting after that went smoothly. I shot 50 rounds of Independence brass cased and then 50 rounds of brown bear. I had one stove pipe on the brown bear, but other than that it was flawless. The last round would not cycle with the .40 mags,but that was expected by the posts above me. I consider myself a beginner shooter and was really surprised how much more accurately I can shoot 9mm over .40. I now wish I would have just bought a 9mm to begin with. Oh well, now I can shoot two calibers. I hope this helps others.
Link Posted: 12/31/2010 5:31:31 PM EDT
Link Posted: 1/3/2011 12:51:01 PM EDT
Link Posted: 1/3/2011 12:54:55 PM EDT
Why won't this work 9 to 40?
Link Posted: 1/3/2011 2:04:45 PM EDT
Originally Posted By GeorgiaBII:
Why won't this work 9 to 40?


inquiring minds and all that
Link Posted: 1/3/2011 7:03:26 PM EDT
[Last Edit: 1/3/2011 7:14:52 PM EDT by Dog1]
Link Posted: 1/3/2011 9:14:59 PM EDT
In my experience, the limiting factor is the width of the barrel hood, the part that protrudes to the rear and engages the breechface cut in the slide. The .40's is wider so .40 can be converted to 9mm but not the other way around.
Link Posted: 1/4/2011 5:39:26 AM EDT
OK stupid me just asked about the reliability of convertion kits and BAM scroll down and find this thread. Damn i love this site....
Link Posted: 1/4/2011 9:08:18 AM EDT
Probably doesn't help much as you guys have already pretty much pinned down the answer, but here goes.

I just picked up my new M&P9 w/thumb safety yesterday. Upon stripping it, it has the same type of machining as your .40 barrel, Dog1. Course, the 2 test fire cases are dated 4-1-2010, so it's been sitting at some distributor for a while.

Thought I'd chime in!

Posted Via AR15.Com Mobile
Link Posted: 1/4/2011 9:17:27 AM EDT
Originally Posted By WIZZO_ARAKM14:
Probably doesn't help much as you guys have already pretty much pinned down the answer, but here goes.

I just picked up my new M&P9 w/thumb safety yesterday. Upon stripping it, it has the same type of machining as your .40 barrel, Dog1. Course, the 2 test fire cases are dated 4-1-2010, so it's been sitting at some distributor for a while.

Thought I'd chime in!

Posted Via AR15.Com Mobile


do you have a .40 barrel accessable to try?
Link Posted: 1/4/2011 9:00:43 PM EDT
Negatory
Link Posted: 1/4/2011 9:34:49 PM EDT
[Last Edit: 1/4/2011 9:35:42 PM EDT by chris65]
Good post OP. Where is the brass landing 40 vs 9? I saw the one post where a 9mm stovepipe jam occured and in that case, it may be handy to have a spare recoil spring with one coil cut-off to allow more slide velocity. Generally, I think 40 slides weigh more than 9s.
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