I agree, I looked for one but I couldn’t find one, so I settled. Its very accurate but hold sensitive. And so twangy.
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Air Arms Detuning AA TX200 MK3. Which route should I go?
- Thread starter cgriff20
- Start date
gonzav71
Member
I use the 12 FPE factory spring with TBT Delrin (manually fitted, sanded down to fit) spring guide, top hat and shims. I have no problems shooting accurately with it. No more twang or vibration. I shoot my TX200HC under 11 FPE and sometimes down to 10 FPE. Still shoots accurately at those lower power levels. I don't shoot my springers from a bench since I shoot field target sitting position.
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They used to, but we Americans were power hungry and wanted the higher power. When they started sending fac rifles no one wanted the 12fte version. Then along came the world class competition to field target. I was a dealer back then and was selling a fac piston and spring along with the 12fpe rifle to get them to sell. After the fac became so popular they stopped sending the 12fpe....nowadays not sure why the 12fpe rifles are not being ordered, I guess folks think just cutting the spring is all that is needed!! In the past couple years I know I sold all the 12fpe pistons I had left.
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I think the best way to 'short stroke' a MK3 (while keeping the stock bore) is to return it to MK1-MK2 stroke length with this piston.
https://www.airgunspares.com/tx320sairarmstx200mk2pistonbody.html
My understanding is that the FAC spring in the MK3 is the same as the sub 12fpe spring in the MK1-MK2. If used with the piston above, it should provide a very close approximation to a factory sub 12fpe MK2 rifle.
Although I've not confirmed for myself, I hear that the anti-bear trap still catches on the rear notch in the compression tube when using MK2 stroke length with a MK3 compression tube.
https://www.airgunspares.com/tx320sairarmstx200mk2pistonbody.html
My understanding is that the FAC spring in the MK3 is the same as the sub 12fpe spring in the MK1-MK2. If used with the piston above, it should provide a very close approximation to a factory sub 12fpe MK2 rifle.
Although I've not confirmed for myself, I hear that the anti-bear trap still catches on the rear notch in the compression tube when using MK2 stroke length with a MK3 compression tube.
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They do here in Canada. Sorry about quality of pic.Crow
Would like to know if they actually use a 12 fpe piston or just modify the spring ? If Canada can get them why not the US ??
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I can’t remember what I did last nite so cross your fingers.
Don’t forget our lovely 13% tax. Crow
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I called today to see if my Vortek sets arrived. Negative.
‘Also enquired about the springs. He said they are factory. He has a choice of 12 FPE or the regular when ordering. Crow
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I'd bet the 12fpe version is nothing more than a spring swap. Actually, I'm almost certain of it.
If they made a short stroke piston, they would also have to make a new compression tube with the notches for the anti-beartrap relocated.
And they offer neither of those parts as replacements. Considering that almost every one they sell in the UK is sub12, I find it even harder to believe that those parts (if they existed) wouldn't be readily available over there.
If they made a short stroke piston, they would also have to make a new compression tube with the notches for the anti-beartrap relocated.
And they offer neither of those parts as replacements. Considering that almost every one they sell in the UK is sub12, I find it even harder to believe that those parts (if they existed) wouldn't be readily available over there.
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I linked this piston further up in the thread...
https://www.airgunspares.com/tx320sairarmstx200mk2pistonbody.html
....it provides the stroke length of the MK1-MK2 guns with the modern latch rod geometry of the MK3 guns. When viewing the notches on the MK3 compression tube you see that one is spaced off from the other 2. When using the MK1-MK2 stroke with a MK3 compression tube, this rearmost notch will still engage the ABT...but not the front 2.
The factory MK3 FAC spring is supposed to be equal to the factory MK1-MK2 sub 12fpe spring. So installing only this piston into a FAC MK3 would reduce the power to UK levels.
The TR ROBB latch rod has a reputation of being made from softer material and causing weird cocking and triggering issues as it wears. The factory short stroke piston/latch rod is much more durable.
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Short stroke was on my mind so went ahead and made my own kit.
Just got finished and Prosport is much better no spring twang as with the old loose spring guide
Turned a nice tight one up in Nylatron as are the piston extension and top hat, a slight radius was required on
Seal undercut to allow fitting of the extension also needed 4 slots to allow expanding to fit a good tap with
My tapometer so this is a nice tight fit.
A bit stringy to turn but pleased with results and new seals now a lot cheaper and easy to change.
New breech o’rings aswell. The spring isn’t standard so would like to get one as this one seems a bit strong but
Will see how it goes 31coils. Hello I will get some photos on.
Shimmed side play in trigger now much better
Piston extension 17.5mm
Copied what a UK guy did but used existing undercut
I got the ideas from guy below but didn’t see the need for screw retaining.
Air Arms TX200 HC Tuning
Details of how I home tuned my Air Arms TX200 HC .22 air rifle to become the best and most accurate spring powered air rifle I have ever used. O-ring piston
Zeroed in at 35yards shown and happy with results I’ve only got an old Nikon p22 2-7 bdc rimfire scope on it but it’s doing the job for me.
6 pellets at 35yards off my knee and thumb nail sized group at 55yards prone will do me. And very smooth cycle.
Total cost around. $14NZ
Not shown with piston guides but definitely fitted before assembling.
Extension diameter nice sliding fit in compression chamber.
I used imperial size o’ring but that’s up to you it works good.
Nylatron specs
The closest to Oilon Nylon is Nylatron GSM which is specifically formulated with a molybdenum disulfide (MoS2) additive. This additive provides enhanced strength, rigidity, and self-lubricating properties to the material. The presence of MoS2 particles helps to reduce friction and wear, making Nylatron GSM well-suited for applications involving sliding or rotating parts.
Guy in Uk been using his setup for about 3 years with no trouble at all with extension and the Viton O’ring
O’ring shown for 1” diameter but I just used info for O’ring depth figure (F) and width (E) still a nice snug fit on groove diameter so no worries there.
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If you are only using the gun for hunting, I would not spend a lot of money on an exotic kit, although I'm sure they do work well and would appeal to target competition shooters. I put a Vortek 12 fpe kit in mine. It actually was shooting more like 13.1 fpe, so I cut 1 1/2 coils off the spring and now it's just a tad over 12 fpe. Each gun behaves differently. Anyway, my goal was to tame the thing down and make it easier to cock for my old bones.
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Very niceView attachment 374192View attachment 374194View attachment 374195Modifications to second hand aa Prosport .177 with twangy action.
Short stroke was on my mind so went ahead and made my own kit.
Just got finished and Prosport is much better no spring twang as with the old loose spring guide
Turned a nice tight one up in Nylatron as are the piston extension and top hat, a slight radius was required on
Seal undercut to allow fitting of the extension also needed 4 slots to allow expanding to fit a good tap with
My tapometer so this is a nice tight fit.
A bit stringy to turn but pleased with results and new seals now a lot cheaper and easy to change.
New breech o’rings aswell. The spring isn’t standard so would like to get one as this one seems a bit strong but
Will see how it goes 31coils. Hello I will get some photos on.
Shimmed side play in trigger now much better
Piston extension 17.5mm
Copied what a UK guy did but used existing undercut
I got the ideas from guy below but didn’t see the need for screw retaining.
Running at around 11.2 ft/lb with 10.3 jsbAir Arms TX200 HC Tuning
Details of how I home tuned my Air Arms TX200 HC .22 air rifle to become the best and most accurate spring powered air rifle I have ever used. O-ring pistonnbroadsman.me.uk
Zeroed in at 35yards shown and happy with results I’ve only got an old Nikon p22 2-7 bdc rimfire scope on it but it’s doing the job for me.
6 pellets at 35yards off my knee and thumb nail sized group at 55yards prone will do me. And very smooth cycle.
Total cost around. $14NZ
Not shown with piston guides but definitely fitted before assembling.
Extension diameter nice sliding fit in compression chamber.
I used imperial size o’ring but that’s up to you it works good.
Nylatron specs
The closest to Oilon Nylon is Nylatron GSM which is specifically formulated with a molybdenum disulfide (MoS2) additive. This additive provides enhanced strength, rigidity, and self-lubricating properties to the material. The presence of MoS2 particles helps to reduce friction and wear, making Nylatron GSM well-suited for applications involving sliding or rotating parts.
Guy in Uk been using his setup for about 3 years with no trouble at all with extension and the Viton O’ring
O’ring shown for 1” diameter but I just used info for O’ring depth figure (F) and width (E)
View attachment 374216
I am very impressed with the accuracy.
Is this set up heat sensitive at all? (probably winter in NZ?)
Wondering if this set up will work in FT competition (longevity? reliability? etc)
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Winter here but not to cold, tested and zeroed with temperature about 14C
The guy that did one out of similar material and Viton o’ring Has not had to strip it down since first assembly in over 4 years so longevity should be ok and reliability well he’s still on his first O’ring and consistent power, you should have a look at his web site as it’s very informative, he has done it on TX200 mk3 in .22 but plans to do the same on his .177 Prosport.
I would like a 4-12 Hawke scope but money dictates what I’m using at the moment.
Used to have aa s410 and s500 pcps but love a pick up and go springer.
For ft competition I’m sure it would be good as the previous owner of my prosport
Had it set up for that but the modifications I have done have certainly improved it for me. Very buzzy before but now quick smooth quieter (pht) noise with 10.3 jsb
not got any other pellets to try at the moment and don’t really want to bother at this time.
I just wanted to get rid of twangy action and Mr Broardsmans Idear appealed as the way to go and a simple bit of turning 3 hours max has worked out good, just didn’t
Fancy fixing on extension with screws but it has done the job for him ok.
I could try a couple of preload washers if I need to increase power but really that was not the objective of the exercise, accuracy is for me. I don’t do FT as I don’t think there is any
In the South Island in NZ I just use it purely for local pest control and an accurate shot at sensible distance is what I need.
Thanks for your reply
Stu
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Mr Brordsman uses his in FT shooting so I would say that it would be good in competition use.
He explains it more in depth and has printed results in ft/lb and his resulting observations of his modification.
He explains it more in depth and has printed results in ft/lb and his resulting observations of his modification.
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The extension has the same retaining angle as the piston with a lead in angle
So when I fitted it I put a slight radius on piston retainer, not everyone will want to do this but I did and with a dab of silicon and a smart smack the extension snaps into place with no screw required, I put 4 saw cuts in extension to allow to clip on, maybe 6 will make it easier, I won’t be going back to the standard seal as I much prefer the o’ring.
See photo
So when I fitted it I put a slight radius on piston retainer, not everyone will want to do this but I did and with a dab of silicon and a smart smack the extension snaps into place with no screw required, I put 4 saw cuts in extension to allow to clip on, maybe 6 will make it easier, I won’t be going back to the standard seal as I much prefer the o’ring.
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