I need to pick up some 9mm Blanks that will run reliably in my Glock 17, or possibly my Sig 226, for a class I have coming up.  I've never purchased or used blanks before so I have no idea what to get or where to get them.

Anyone have any recommendations on where or what to get, or maybe point me in the right direction.

Thanks!

What he said... Plus, in my brief, fleeting, experience, the terms 'blanks', and 'reliable', never go in a sentence together without the words 'are not' between them.

Try here for Glock/Sig blank firing barrels
http://mfgresearch.net/page8.htm

Alternative way is to have a skilled prop armorer block a standard barrel with the
appropriate aperture size so the now "prop gun" will cycle reliably.
Using different brands of blank ammo may require different aperture sizes.

In the movie biz, most use Swanson Motion Picture Blanks because they
are loaded hot and produce more muzzle flash for dramatic effect.

Aperture size for 9mm pistols blanks are usually .165" - .187"

Thanks to everyone for all the help and info.  I'm really glad you filled me in.  I'm not sure whats going on but I have a feeling that the person organizing this class didn't realize that you couldn't just get blanks, load them, and have them go bang.  Either that, or there was some sort of miscommunication or mis-wording.

The club I belong to has a 2-Gun Tactical each month (Its not a competition based event like a 3-gun, its more of a non-scored 'learning' event to give us a chance to improve our skills).  In order to participate you need to take an "Intro" course first, which is what I'd signed up for.  After signing up I'd received an automated e-mail saying that I'd need blanks for my sidearm and rifle which led me to post this question here.

I think it must be some kind of foul up as I don't really think they'd expect folks to pick up special barrels and such.

The only commercial blank ammo that would chamber in a normal 9mm pistol is the Fiocchi 9x19mm Salve blank, though it won't cycle the pistol.

Fiocchi 9mm Salve

Regular 9mm PA Knall blanks made specifically for model blank guns probably won't even chamber in real firearms.

 

And often black powder.
The flash from smokeless is so short it often fails to show.
The shutter spends way more time closed than open.
Think 24 frames per second each exposed for 0.001 of a second.
That is 0.024 of 'open' shutter per second.  2.4% of the time.
How long does the flash last?

The same applies to digital sensors.
They spend most of the time reading out.

You certainly detail valid points.
Motion picture blanks use black powder for as much muzzle flash as possible.
Sometimes prop guns will also be fitted with specially designed muzzle flash enhancers.
They also get gunked up fast with the use of black powder.

Try this

They have a G17 barrel and 1000 blanks for $150