I get asked this a lot.

Yes, you can add a 40 barrel to your 10mm pistol and it is pretty easy.
Here are some pics of what I did to add one to my Colt Delta Elite.

First, find a barrel. This is pretty easy depending on your pistol. Here are a couple of sources:
1911 5" - Numrich (Kahr)
1911 4.25" - Brownells (Storm Lake)
Glock - Lone Wolf Dist.
Tanfoglio - EAA

I bought one from Numrich for about $80. It is a very nice 416 stainless barrel. The crown is actually nicer than the stock barrel:

A 1911 is old school (i.e. not modular) so it requiries fitting. It should be minimal and any gunsmith will be able to do it. Other platforms probably will not.

I was going to buy the Wilson video, watch it and fit it myself. However, I sat on the barrel for about 3 months before I decided to just take it to my local smith and have it fit. It took him a few days and cost me less than $50.

Here is what it looks like:

What about mags and springs?
Good questions.

I put it in a 20# Wolff with a standard guide plug that I already had.
I also used the stock 10mm magazines and it has worked perfectly with several brands of ammunition.

If I was to rely on it for self-defense --not sure why I would underload a 10mm--but I would get a couple of 40S&W 1911 magazines with the spacers. The OAL differences of the two cartridges is pretty great so I would be worried about potential feeding problems. Since this is just to use cheap(er) range ammo, it is not an issue for me.

Pretty neat setup for minimal cost.

One of my favorite pics--My pair of 10mm's.

(Left)Dan Wesson Classic Commander Bobtail
(Right) Colt Delta Elite

1000 Starline cases
1000 Hornady XTP 180gr bullets - they came free with my Hornady LNLAP press!

01/09/11: It has come to my attention that the contact me form doesn't work since I turned off comments. My email address is now listed on the About-Contact page. If you haven't heard from me, my apologies, please email me directly.

12/17/10: I think that is as good as it is going to get. I am converting the pics over to local (instead of Flikr) so performance will continue to improve.

11/26/10: Our web host lost their mySQL server. I have restored the site here with an old backup. Please bear with me as I attempt to return it to its full functionality.

currently on the web. Feel free to join in on the discussion. I try to visit this thread regularly.

Link:
Northeast Shooter's Discount Thread

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Link to form

I don't know why, but it is on the FNP only, but very good pricing.

Link to form

Trijicon offers a special discount program. Instructors are able to purchase (1) set of night sights and (1) optic per year.

In order to obtain pricing you must supply your credentials (email, fax, etc) and request pricing for specific items.

Link is to contact Trijicon customer service.

Click on post title for link.

Link to online pricing

Link to form