That's one of the first things I did with my 125 sniper is take the edge off the trigger guard with some 400 then 800 grit. It had a better edge on it than a couple pocket knifes I have.I also put a star lock washer between the screw end and the posts for the comb with blue loctite on the screws good and snug. I put mine all the way down and it hasn't moved after 800'ish shots. The star washers I used have the teeth on the inside of the washer. I also sanded the ends of the comb screws flat, they are kind of concaved so there isn't much surface area contacting the post. If that didn't work or if it fails I'll just grind flat spots in the comb posts for the screws so it will be impossible for the comb to move up.*Trigger Guard*Unless you could get Hatsan in Turkey to send you a metal trigger guard plastic is the only option I know of
Hope they work out for you, like I said mine hasn't moved, I looked at a couple options of locking it down and this was the quickest and easiest. The ends of my screws, like most threaded screws had the concave lip on the end, kind of a lip on the end. I just used a sanding belt to make the ends flat, took 30 seconds. With the end of the screws flat they contact the star washer better.Besides notching the posts I kicked around sanding the ends of the comb screws to a more or less a point, kind of a crude setscrew.
Speaking of the trigger guard, does anyone know where I could get a metal one to replace the resin one that comes with these Hatsans?Dennis