Tuning Hatsan Flash .22 Modifications and Upgrades (Heavily Modified)

Hi,

I bought the Hatsan Flash .22 about a year ago. The model is the synthetic stock model and with the QE system on it. It has been a great PCP to have and I have had a lot of fun with it. While having it I have had in mind to modify it and make upgrades to the gun. My idea would be to build heavily upgraded Hatsan Flash now and I already have a few things in mind. The goal would be to have a consistently shooting sub MOA gun built that can shoot the FX hybrids around 950fps and shoot pellets accurately around 900fps. I would like the gun to be able to shoot up to 200 Yards, but I think it is a daydream with this base. I would be happy to achieve consistant accuracy of around sub MOA in 100 yard range too.

I know this might be nearly impossible to do on a sub 300$ base. It is always have been my interest to make everything better with some small upgrades and I love tinkering with stuff. Lets see how this project starts to go forward. I have already put some parts and ideas together and talked with more experienced airgunenrs here on the forum. I am having a "cheaper" and more "expensive" build in mind.

Cheaper build:
- Huma-Air regulator with XXL plenum
- Hatsan NovaStar barrel upgrade
- Hammer spring upgrade to NovaStar spring
- Air Valve seat upgrade to ported PEEK valve seat
- Transfer port opened to 180 thou all the way from barrel to air cylinder valve opening
- Cleaning the action and cleaning the barrel

Expensive build:
- L&W 30" poly barrel upgrade
- BT65 255cc air cylinder upgrade
- Huma-Air regulator with XXL plenum
- Hammer spring update to NovaStar spring
- Air Valve pin seat upgrade to ported PEEK valve
- Transfer port opened to 180 thou all the way from barrel to air cylinder valve opening
- Cleaning the action and cleaning the barrel
- FX no limit scope rings
- Bushnell Match Pro scope 6-24x50FFP


The setup I have in the beginning is:
- The Hatsan Flash of course
- Hawke Vantage 4-12x40
- UTG Leapers high rings
- DonnyFL Tatsu moderator
- UTG Leapers cheapo bipod

During this COVID-19 times it seems I have had too much of free time and I decided to start a YouTube channel just for the @$%^ and giggles. You can follow me on YouTube under the name as here Montana_AirGunner. I have a few videos there where I am going throught the mods I have been doing to the gun already :)



https://www.youtube.com/channel/UCbGz8C9DbaUfZhUNnqBIlAg
 
Finally I had time to go and get some testing done with some pellets slugs. Pretty amazing results just as its on. I do feel that the 165BAr was too high and you will just get a dimished shot count with that high of a pressure. I tested it with 155BAR in the past and got somilar speeds but better shot count. I feel that I have to start to modify the pellet probe to get the last bit out of the power side. I have the regulator set at 165BAR and the hammer spring is 3 turns out.

Notes: fx 18gr pellet 165bar ns

Shot count: 11
Low: 988
Hi: 995
Avg: 992
Spread: 7
STD Dev: 2.5
988
995
993
995
988
990
990
993
993
993
993

From the data you can see that the 18.1gr pellet is showing pretty unbelievable results. I have to say that it also was very accurate in 100y range. Almost MOA, I have to say this was in a windy weather almost the best 5 shot group I have shot in those conditions


Notes: fx 18gr pellet 165bar ns

Shot count: 24
Low: 928
Hi: 997
Avg: 976
Spread: 69
STD Dev: 22.0
997
990
993
990
988
990
993
993
993
990
993
993
990
984
981
977
967
960
958
951
946
939
932
928

Here is some other pellets at the same settings.

Notes: fx 25gr 165bar ns

Shot count: 17
Low: 842
Hi: 898
Avg: 880
Spread: 56
STD Dev: 16.5
893
895
891
877
895
898
893
893
893
865
872
888
877
877
854
863
842

Notes: fx 25gr pellet 165bar ns

Shot count: 17
Low: 828
Hi: 893
Avg: 881
Spread: 65
STD Dev: 17.4
875
888
893
893
893
891
893
891
875
893
865
893
879
886
875
858
828

Lastly I shot a couple of slugs

Notes: jsb ko 217 25.43gr 165bar ns

Shot count: 5
Low: 865
Hi: 877
Avg: 871
Spread: 12
STD Dev: 4.9
872
868
865
877
875

 
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I love the flash but the first things I would do is figure out a larger air tank/bottle for it's shot count then a reg. I have never owned one but have shot one before and was pretty impressed, especially for it's price. Good luck with your tinkering. I am the same way with modding budget rifles. I have an avenger and gauntlet that have over $1000 bucks into each lmao. Here is my avenger in 22 that is 60fpe capable.
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Today I had some freetime finally and I did some serious upgrades! I mounted the 30" L&W barrel I got from the gunsmith and it looks pretty crazy. 
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I also got my Bushnell Match Pro 6-24x50 scope mounted with FX no-limit rings. I decided to get longer screws for the rings that hold the scope in place, because some people seemed to have a problem with how they short they were. I didn't want to have the same problem and that's why I got the longer ones. I also bought a Wheelers anti-cant indicator and mounted it.



Iw ould seem that now I just have to go to the range and zero it. Then I will have to find out what is the best ammo through it and do some testing :D Pretty exciting times!
 
Yeah the shot count is really something I was after too. I found a BT65 air cylinder that goes straight on to the Flash. Now I have a 255cc air cylinder on my Flash. Yesterday I got a L&W barrel back from a gunsmith and now I have a 30" barrel to put into the flash! pretty crazy :D

Hey, uh, whatcha doin with the old cylinder?