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Alstone · Moderator & Site Supporter

It seem that a lot of people have trouble getting the safety on a TX200 to re-set, I have also had this problem and it is annoying, so I decided to have a look at the problem.

The safety works by blocking the shear lever from moving when the trigger is pulled, to fire the gun you must push in the safety and squeeze the trigger, so far so good. Now you need to re-cock the gun for the next shot, in performing this task the piston and latching button is pushed back into the trigger unit, first re-setting the latch for holding the piston and spring ready for the next shot, next the latching button must carry on and move the shear lever out of the way of the safety, to allow it to re-set. When all this is done your ready for your next shot.

So the problem seems to be that the cocking system is running out of puff by the time it get to re-setting the safety, so the general idea is to snap the cocking lever back to get the safety set. This may be all right but I don’t think it does the gun any good getting this rough treatment.

I appears that the tolerances used by AA when building the trigger unit are not good enough to make all guns work the same, so they use an optimum setting that suits all guns some better than others, on my gun I needed 0.015” on top of the shear to get the clearance for the safety to reset smoothly.

To do this I soldered on a 0.015” brass plate on top on the reset part of the Shear, I made it L shaped to give it more area to hold it to the shear, so far this as worked well with no problems and the safety works very smoothly every time.

This mod does not interfere with the normal operation of the trigger also the loading on the shim is very light,

Have fun

Al

donec · Senior Member

What kind of solder did you use?

Alstone · Moderator & Site Supporter

Just ordinary soft solder, I tinned both surfaces first put them together and used a small blowtorch to apply the heat. Provided you keep the heat to the minimum it will not effect the hardness of the shear.

This is not much pressure on this part of the shear lever, so I don’t think there is much chance of the brass plate coming lose.

Al

PS: If you need help stripping down your trigger unit then have a look here:

http://airgunhome.com/agforum/viewtopic.php?t=1142&highlight=trigger