Airgunning

     Air Arms TX200 stripdown      

Disclaimer: if and when you decide to follow these instruction, please be aware that I cannot be held responsible for any physical or mechanical damage that might occur.  

- First remove the stock screws.

- remove the screws at the trigger guard, start with the front trigger guard screw.

- next remove the front screw (when reinstalling, tighten the rear trigger guard screw first and don't overtighten).

- remove the action from the stock.

- remove the clip securing the pin that holds the cocking link to the underlever. Make sure the clip doesn't launch itself in outer space.

- remove the pin ...

- and carefully remove the cocking link.

- carefully remove the cocking link from the compression tube, don't use excessive force.

- unscrew the fixing nut that secures the trigger house while holding the end of the gun to a soft surface.  There is little preload on the spring.

- there's very little preload on the spring so the trigger block slightly slides backwards when the nut is removed.  In this case, the gun already had a FAC venom spring inside, but still there was very little preload. Nevertheless the gun was doing 15.5 fpe.

- remove the spring, compression tube and piston.

- AA 12 fpe spring on top, FAC venom spring in the middle, 12 fpe venom spring at the bottom.

- all parts are degreased carefully and checked for blemishes (burrs etc.) which are corrected if possible.  Polishing some of the parts might be a good idea.  When everything is OK, the gun can be put together again or a Venom tuning kit can be installed. 

- time for a new and better piston seal.  Unseat the old seal, a flat screwdriver comes in handy.  Put the screwdriver under the seal and off it goes.

- I decided to fit a Maccari TX200 seal.

- the seal and piston are treated with the appropriate lubricants (less is better) and re-installed in the compression tube. The compression tube is treated with some molygrease and re-installed in the action.

- time to re-install the spring.  For the spring I use maccari heavy tar instead of molygrease.  Don't use too much tar, only a tiny coat on the outside of the spring. Rubber gloves are advisable, unless you like black fingers.

  - the trigger is fine-tuned.  The contact points are polished.  (pic is from a Pro Sport trigger, which is identical.  The trigger of this TX was already tuned so I didn't take it apart.)

- reinstall in reverse order and you're ready for the first shot.

April 24, 2005 by Mario Severi