charub,

I have found that in general, WRT air pistols & rifles, it is unlikely you will need anything stronger than Loctite 222 (Purple).

Chappies often use the 240 series (blue) as the first port of call, but over the years, I have found 222 to be all that is needed.

Some screws/bolts (e.g. front trigger screw/bolt) on the TX200), should have no thread-locker on them at all.

I have found this through bitter experience - I used 242 on that screw on the TX200, and the next time I tried to remove it, it unscrewed the main action screw holding the trigger block and spring - that was not fun

Have fun

Best regards

Russ