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PostPosted: Sat Oct 22, 2011 1:37 pm 
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Posts: 516
Location: Surrey, BC
Hi Guys
I like to know if anyone can give me any advise how to detune my gun

It is shooting around 950 FPS
I like it to shoot around 830 - 850fps

Anyone have any advise please let me know

thank you very much

Biagio

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PostPosted: Sat Oct 22, 2011 1:48 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
Biagio26 wrote:
Hi Guys
I like to know if anyone can give me any advise how to detune my gun

It is shooting around 950 FPS
I like it to shoot around 830 - 850fps

Anyone have any advise please let me know

thank you very much

Biagio


shooting 10.5 grains?

get a softer spring?

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PostPosted: Sat Oct 22, 2011 2:45 pm 
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Location: Toronto, ON
typically you cut a coil or two off your spring, here's a good 'how to' on it http://www.air-rifle-tuning.com/v-mach/ ... s/AS01.pdf

While you're at it, it may be a good idea to purchase a tune kit for it, this will include a better fitting top hat and spring guide, perhaps a piston sleeve too.

Go slow, 1 coil at a time. If you cut too much off, you can put a spacer/weight in the front of the spring (metal or plastic washer).

These rifles were designed to be used in the UK, so designed for sub 12fpe, so you'll find they shoot best when tuned to sub 12fpe, which is under 800 fps using a JSB 8.4gn pellet.

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PostPosted: Sat Oct 22, 2011 4:07 pm 
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Joined: Sun Sep 04, 2005 11:23 am
Posts: 626
Location: B.C.
Hi Biagio, I have used Maccari springs in a few of my guns with great success. You may want to look at :
http://www.airrifleheadquarters.com/cat ... 004105.htm
http://www.airrifleheadquarters.com/cat ... 037321.htm
http://www.airrifleheadquarters.com/cat ... 613069.htm
Can be installed at home, but you really should have a spring compressor available for dis/re assembly for ease and safety. HTH

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PostPosted: Sat Oct 22, 2011 5:42 pm 
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If you want to purchase from Canada, the vortek kits are great
http://scopesandammo.com/storefront/ind ... ts-c-38_67

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PostPosted: Thu Oct 27, 2011 1:01 pm 
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Thank you very much

The kit sounds like the best way to go, or maybe I should just shoot it the way it came to me.

The gun is great, but I do think it's too fast for FT, or isn't it?

I'm not sure

thanks for all the tips guys

Biagio

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PostPosted: Thu Oct 27, 2011 2:04 pm 
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Posts: 641
Biagio26 wrote:
Thank you very much

The kit sounds like the best way to go, or maybe I should just shoot it the way it came to me.

The gun is great, but I do think it's too fast for FT, or isn't it?

I'm not sure

thanks for all the tips guys

Biagio

Try Walters idea of the 10.6 gr pellet..kelly


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PostPosted: Fri Oct 28, 2011 2:17 am 
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Posts: 87
Location: norway
Have anyone tried the short stroke piston to detune a FAC TX200?

I see that Chambers sell a piston with a 31mm longer stem, which will give a shorter stroke.


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PostPosted: Fri Oct 28, 2011 10:36 am 
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Location: Ontario
Generally, a recoiling springer in high power mode is not best for Field Target. Too much recoil equals too little accuracy.

There were great tips given above on what to do to reduce recoil. A pellet change does not address the concern. The AA TX 200 is super easy to work on. Great spring gun to learn on.

Your options, in order of cost (least to most expensive):
- cut the factory spring down (as described above)
- measure the factory rear guide, and write Jim M. for a spring that will work as a low power option that fits the factory guide.
- UK spec factory Air Arms piston (12 foot pound piston), and factory sub 12 foot pound spring. Contact Air Gun Source and they will order it.
- Vortex 12fpe tune kit

Field Target has a maximum power limit of 20fpe in the Open divisions, but the World Field Target Division, which follows the international rule set for all World Championships and standard rule set of the majority of countries sets a limit of 12fpe. So that is around 800fps with JSB Exact pellets (8.4g), 825 with Crosman Premier or JSB Express (7.9p), etc. Your gun will shooter much smoother at lower power, making it more pleasant to use, but you will also be able to shoot it more accurately. But it is up to you, and certainly you can shoot Open Piston or Hunter Division with it still shooting full power, but not the WFTF Division that most spring gun shooters shoot in.

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PostPosted: Sat Oct 29, 2011 9:13 am 
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Joined: Mon Oct 24, 2011 6:37 pm
Posts: 17
I just purchased the TX 200 and had the same problem. Air Gun Source had a spring kit for this gun which I ordered just yesterday. The number is 1-800-565-9527 and talk to Travis or Curt. It was $28.00 plus shipping.


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