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Topics - xyon

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General Airgun Discussion / converting a pcp air rifle to a pistol
« on: August 04, 2018, 05:57:13 PM »
I am undertaking or at least about to undertake building a pcp pistol. I was going to use a crosman 2250 as the starting point so I could use the barrel, breech and trigger from this. But I think I may be able to obtain a pcp rifle which should give me a better quality barrel and breech to start from, also I can reuse the valve and hammer and just shorten the air cylinder. Would this be legal or just a crime against the air rifle concerned  :-)

Modifications / pcp air tube material
« on: August 02, 2018, 12:53:05 AM »
I found this tube in the Nalco catalogue.
31.0 mm OD
5.0 mm Wall thickness
Alloy 6261
Temper T5

if the yield strength is 240 MPa then the pressure at yield would be 770 Bar (11200 psi) acording to my calcs. That would give a safety factor of 3 for 3700 psi fill or more for a 300 psi limit.

Is this alloy ok to use? I would like some 7075, but this is probably unobtainium in tube in NZ?

I've got too many air rifles, so I've listed 3 on TM. If you are interested message me directly...
The Cometa is the nicest, but the Kral is the sleeper, only shooting 12fpe, but quiet and accurate.

For Sale, Wanted, Spotted / Gamo 2 stage trigger for sale
« on: January 31, 2018, 09:31:30 PM »
I've got a nice replacement for the Gamo plastic trigger for sale on TM

Much nicer than stock, give a true second stage which can safely be made nice and short.

Modifications / Zoraki barrel
« on: November 13, 2016, 09:56:59 PM »
The weather has been crap over the last few days here. So I managed to find some time to dust off the lathe.
I had acquired a barrel with 1/2" UNF thread already on the end. After removing quite a bit metal I ended up with this. My Ultra look alike barrel  :) Bottom one is the original.

General Airgun Discussion / shooting low
« on: October 18, 2016, 09:00:48 PM »
I recently sighted in my Gamo CFR at 30M. I then wanted to see where it would shoot at 50M so I set up a target at 50M. I was surprised to see the POI was about 26cm lower than at 30M. The only thing I changed on the scope was the AO/focus. The pellets I was using are JSB exact jumbo express .22 (14.3 grains). I don't know what fps the gun is shooting at. Is that the sort of result I should be expecting?

General Airgun Discussion /
« on: October 16, 2016, 05:26:23 PM »
I was wondering if anyone has ordered any seals or parts from ?


Modifications / Gamo Trigger Mod
« on: October 13, 2016, 12:14:48 PM »
Hi all,
My first real post. I wanted to convert my Gamo CFR to a real 2 stage trigger. After doing a bit of reading about the GRT-4G trigger and seeing  they don't export it from the USA any more I decided to take matters into my own hands.
After disassembling the trigger unit I could see that newer plastic trigger has a great gap for the spring right where you would want to have a bump to lift the sear for the first stage travel.

I was thinking about making a new trigger out of aluminium, but I don't have a mill so it look like quite a bit of work so I decided to try modifying the existing trigger - without damaging it.
I came up with a metal insert like this.

The pic looks like the plastic is all scuffed up, but it's just wax I used to model where I wanted the lift point to be. The insert is quite a firm fit so should not move around much, but to be sure I glued it in place.

After reassembling the rifle to test it I found the second stage was too short, ie it would discharge almost as soon as I felt the second stage (the original sear lift point on the trigger). So I dissembled again an filed about 0.3 to 0.4mm from the  insert an now it seems perfect.

Only downside from an after market trigger is it is not adjustable.


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