The flashguard doesn't make much noticable difference to the shooter. It is to protect those off on your vent side.
You can make one for any gun that has an exposed head frizzen screw by cutting a 1" section of copper pipe, splitting it down one side and then using metal shears or a Dremel tool to cut it into a "d" shape. The leg of the "d" has to squeezed flat in a vise and must be large enough to allow for a hole to be drilled for the frizzen screw.
Or, you can pay Ted Cash $2 for one of these (the plain one)
Unfortunately, T/C has a frizzen screw that has the head behind the lockplate as I recall. You're only chance is to find a longer screw. I'd start with T/C
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Thompson/Center Arms
Farmington Rd., Rochester, NH, USA 03867
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Thompson/Center Arms
P.O. Box 5002, Rochester, NH, USA 03866-5002
Phone(603)332-2333
Fax(603)332-5133