Sorry, can't help, but I would like to see some pics if you have the means.
Deluxe247 said:Welcome to the club.
I've heard that the compensators are rare and hard to come by. You will probably need to watch the online gun auction sites for one.
You might also want to create a "wanted" post for one here: http://www.steyrclub.com/modules.php?na ... forum&f=19
You could also contact Steyr directly and ask them.
Good info on the GB here: http://remtek.com/arms/steyr/gb/gb.htm