It's a non-optional part of my safety gear, Manning. A pistol player doesn't have that big trombone out there to block all the hits, as you saw.
The one I use is from the Vents Predator, I believe regular Vents had them too. I can say without the slightest remorse that I paid $30 for a set of predators in 1996 and took the throatguard and threw the rest of the mask in the trash.
The neckwrap throatguards are awful, the roningear one is the best if it comes to that.
The predator guard is stellar, it gives great coverage from the front, uphill or down. When shooting crossbody, it blocks up tight as well:
Alpha434 might have them, but I would send my buddy Manning one!