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The Airgun comes in 2 calibers 4,5 and  5,5 manufactured in England. The specific gun version is the latest (mk3).
 Technical Features
· Airgun springer
· Muzzle velocity (vmach):??
· Weight:4.2kg
· Caliber:4.5mm
· Total Length:105cm
· Barrel length :33.5cm-over-tube-39.5cm
· Stock : The specific is from beech wood but comes also in walnut wood with possibility RH or LH
· Cocking: Under lever type
· Barrel: Lothar Walther 20mm O.D -choked muzzle end-Built in moderator
· Trigger: Adjustable for and resistance and length between stages
· Sights : None
· Safety: Automatic type weihrauch 77/97
· Rail type for scope: With holes for Pinstop type weihrauch 77/97
company site : http://air-arms.co.uk/products_TX200.html
External appearance  - Operation
This airgun is the newer version MARK III. The stock is with the new engravings fishscale type that are really up scaling the rifle.
(http://http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/TX200-walnut-grip.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/Untitled-10.jpg)
The wood quality is perfect  and I can really say that the stock is flawless. The same principle applies to the blueing of the gun which is the best
I have seen on a rifle.
The rifle might be on the heavy side but when you mount it becomes very well balanced and comfortable to shoot.
Cocking is under lever type and especially after the installation of vmach kit is very sweet so that you can cock it with one finger.
Placing a pellet in the barrel is something that is very easy to perform the rifle is made in this way so even with a long scope hanging over
the loading port can be made without a problem.
During the cocking process there is an extra safety on the rifle that holds the compression chamber in three stages.
This function prevents the closing of the shutter port in order to avoid accidents.
The only disadvantage is the characteristic sound during the cocking process that can be eliminated if we press the side safety pin during the cocking.
The rifle trigger is amazing, a bit hard that becomes better after some shoots.
The rifles recoil especially now at the 13,5 libres now with the Vmach installation is minimal. The specific model has a shroud over  the barrel. This results to really quiet rifle.
As bought from manufacturer the rifle had a minimal "touang" noise from spring that was eliminated after the installation of Vmach
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00212.jpg)
Trigger , characteristic engraving type fishscale and rose Pistol grip cap
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00207.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00209.jpg)
Rear safety catch weihrauch type, front safety cocking catch and the front port of compression chamber with the 3 characteristic notches:
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00210.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00211.jpg)
Upgrading  V-MACH
Primarily we take apart the rifle which is something very easy. After removing the stock the next step only is to remove the bolt
that holds all the internals of the rifle.
The pre compression of the spring is zero and there is not need for use of any decompressor.
Analytical information of how one can disassembly the rifle can be found here:
http://users.skynet.be/mario.severi/airgunning/TX200%20strip.html
http://www.freewebs.com/stripdowns/tx200hcstrip.htm
I was impressed by the internal parts which were all so well polished so i could not find any flaw or burrs  or anything else that will seem negative to comment.
Even the greasing of the rifle was very good and cautious.Following the kit installation.
The vmach kit was apparted by a pre greased spring ,guides, simms to increase compression of the spring ,
new o ring  type  Power-Pulse and a guide for installing the o ring.
A view from the spring and the guides ,pay attention how well greased are . The new O ring Power-Pulse at the piston and the
compression increase simms 5 in number.
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00162.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00164.jpg)
After the kit installation the rifle started to reassemble .
Upgrade of the trigger
Before starting i have to mention that anyone has not tried such kind of operations or have not any relevant experience
is better not to try it without some help ,the trigger system is not the easiest to handle .
The trigger disassembles quite easy i present a drawing and we  start.
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/bamtrgger.jpg)
Having all the rear block at our hands ,we  remove the 2 pins hitting it with a 4 mm pointed pin in order to remove the trigger mechanism:

 (http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/Trigger-Strip3.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/Trigger-Strip2.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/DSC00222.jpg)
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/Trigger-Strip.jpg)
   Please pay attention when you remove the trigger mechanism to hold inside the safety in order to avoid loosing it together with the spring .
Afterwards remove only the pins you see on the above picture hitting them with a 3mm pin.
The mechanism in now disassembled  ready for our operations.
 We follow the guide for Polishing as i shows below:
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/Trigger-Strip1.jpg)
With a very fine sand paper we sand minimal the places (not for long)just to eliminate the heavy burring .
After this we polish it with polishing paste " brasso" only the contact points as shown in the photo in order to have perfectly polished contact points. When we finish the whole process we move on the the reassembly of the rifle.
First we remove the old grease from everywhere by thoroughly cleaning them.
Afterwards we grease by applying to a cotton bud all the contact points , minimal and internally the housing block of the inner trigger system
(use light grease).
Attention very small portion of grease and good spreading.
After finishing the greasing the trigger block is ready to be placed in its position.
When you place the trigger block  first put in the safety pressing it inwards and after this you place into position the trigger block.
Result
The trigger feeling is quite softer at least at half of what it was the original sense.
Transition from first stage to second is softer and with a light drop.
With few words if someone can perform polishing of the trigger mechanism this is something i strongly recommend.
Even at the eyes of ignorant shooters the difference is obvious.
Rifle testing
After making the necessary upgrades and the rifle was assembled again i perform some shoots in order to make some tachograph
measurements with various pellets.
In this point i would like to mention that the rifle shoots perfectly the pellets  jsb exact ,webley mosquito ,Η&Ν FTT tested ,and very well
comments are heard for the logun penetretor pelets.
So we start.
(http://i421.photobucket.com/albums/pp293/razorscrete/AIR%20ARMS%20TX%20200%20MK3/jsb-moscito.jpg)
The rifle performs at 13.5 libres of power and possibly after 1000+ shoots and increase of 1 libre could be accomplished.
The TX has the tendency to increase their power after some number of shoots.
Ending I would like to  present some groups made by the rifle. Zeroing of scope at 20 meters with hawke airmap scope 10 shoots at 40 meters 5 shoots
with some air.
Trigger setback Upgrade by Seerhan
http://www.youtube.com/watch?v=0aliy60-B-A
Upgrade  to srs-placing open (iron) sights
http://www.youtube.com/watch?v=XTPzpMVcKZE