Hatsan Jet I/II Discussion

[naptemp]

I have just used the washer (usually an M4 washer) around the valve stem method on a Hatsan Invader.

Stock I got 36 shots (3 magazines) 905-940 FPS with CPHP .22 cal.
After adding the M4 washer I am getting 60 shots (5 magazines) 820-860 FPS with CPHP.

The washer around the valve stem method can be used on any Hatsan air gun which has the air tube and valve attached together.

[ModFox]

I have just used the washer (usually an M4 washer) around the valve stem method on a Hatsan Invader.

Stock I got 36 shots (3 magazines) 905-940 FPS with CPHP .22 cal.
After adding the M4 washer I am getting 60 shots (5 magazines) 820-860 FPS with CPHP.

The washer around the valve stem method can be used on any Hatsan air gun which has the air tube and valve attached together.

Sorry if I missed it, when you lower the fps 10% with the exact same shot deviation of 40 fps, youre only doing this for more shots at the range? It's a nice mod but I'm not ok with reducing power, personally, as the .25 Jet is already down there into the 600fps range. I'm focused on replacing the cylinder with a larger tube, when I find time. If it takes me 5 clips to get a rabbit I'm a f-up and shooting with a different fps than I would use hunting seems counterproductive so I prolly won't do that particular mod myself.

Lol it dawns on me that we will mod anything in any direction just playing around. Were there a gun that could shoot 60 shots in that 800fps range, with that washer installed in the factory, I might be the guy to say "Hey, if you were to play with that washer you would get 10% higher fps with a lower shot count, how great is that?" Lols. Not trying to say its not a good mod or diss naptemp. It is a good tradeoff, giving 10% velocity for 50% shotcount increase. The difference in power would almost be unnoticable at that speed I would think.

[miksatx]

250b shot down to 100b.

Airgun High Power, 7.9 hp

Shot count: 62

Low: 643 FPS
Hi: 844 FPS
Avg: 775 FPS
Spread: 201 FPS
STD Dev: 59.4 FPS

16-Mar-2024 17:22:43,819,FPS,26.8,FT Lbs,
16-Mar-2024 17:22:55,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:23:03,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:23:12,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:23:29,842,FPS,28.3,FT Lbs,
16-Mar-2024 17:23:37,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:23:44,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:24:32,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:20,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:27,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:26:50,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:27:08,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:27:21,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:30,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:45,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:27:58,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:29:52,840,FPS,28.2,FT Lbs,
16-Mar-2024 17:30:03,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:30:14,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:30:27,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:30:58,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:31:12,817,FPS,26.7,FT Lbs,
16-Mar-2024 17:31:49,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:32:00,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:33:38,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:33:48,803,FPS,25.8,FT Lbs,
16-Mar-2024 17:34:13,812,FPS,26.4,FT Lbs,
16-Mar-2024 17:34:25,800,FPS,25.6,FT Lbs,
16-Mar-2024 17:34:42,805,FPS,25.9,FT Lbs,
16-Mar-2024 17:34:59,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:25,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:34,789,FPS,24.9,FT Lbs,
16-Mar-2024 17:37:07,786,FPS,24.7,FT Lbs,
16-Mar-2024 17:37:21,782,FPS,24.4,FT Lbs,
16-Mar-2024 17:37:35,777,FPS,24.1,FT Lbs,
16-Mar-2024 17:37:47,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:03,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:10,768,FPS,23.6,FT Lbs,
16-Mar-2024 17:38:21,765,FPS,23.4,FT Lbs,
16-Mar-2024 17:38:30,763,FPS,23.3,FT Lbs,
16-Mar-2024 17:40:14,756,FPS,22.9,FT Lbs,
16-Mar-2024 17:40:22,747,FPS,22.3,FT Lbs,
16-Mar-2024 17:40:30,745,FPS,22.2,FT Lbs,
16-Mar-2024 17:40:37,742,FPS,22.0,FT Lbs,
16-Mar-2024 17:40:46,733,FPS,21.5,FT Lbs,
16-Mar-2024 17:40:53,735,FPS,21.6,FT Lbs,
16-Mar-2024 17:41:00,724,FPS,20.9,FT Lbs,
16-Mar-2024 17:45:32,721,FPS,20.8,FT Lbs,
16-Mar-2024 17:46:54,719,FPS,20.7,FT Lbs,
16-Mar-2024 17:47:01,712,FPS,20.3,FT Lbs,
16-Mar-2024 17:47:07,707,FPS,20.0,FT Lbs,
16-Mar-2024 17:47:24,696,FPS,19.4,FT Lbs,
16-Mar-2024 17:47:45,698,FPS,19.5,FT Lbs,
16-Mar-2024 17:47:55,689,FPS,19.0,FT Lbs,
16-Mar-2024 17:49:18,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:24,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:29,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:36,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:44,666,FPS,17.7,FT Lbs,
16-Mar-2024 17:50:02,659,FPS,17.4,FT Lbs,
16-Mar-2024 17:50:16,668,FPS,17.8,FT Lbs,
16-Mar-2024 17:50:41,643,FPS,16.5,FT Lbs,

[naptemp]

250b shot down to 100b.

Airgun High Power, 7.9 hp

Shot count: 62

Low: 643 FPS
Hi: 844 FPS
Avg: 775 FPS
Spread: 201 FPS
STD Dev: 59.4 FPS

16-Mar-2024 17:22:43,819,FPS,26.8,FT Lbs,
16-Mar-2024 17:22:55,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:23:03,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:23:12,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:23:29,842,FPS,28.3,FT Lbs,
16-Mar-2024 17:23:37,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:23:44,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:24:32,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:20,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:27,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:26:50,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:27:08,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:27:21,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:30,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:45,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:27:58,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:29:52,840,FPS,28.2,FT Lbs,
16-Mar-2024 17:30:03,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:30:14,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:30:27,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:30:58,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:31:12,817,FPS,26.7,FT Lbs,
16-Mar-2024 17:31:49,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:32:00,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:33:38,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:33:48,803,FPS,25.8,FT Lbs,
16-Mar-2024 17:34:13,812,FPS,26.4,FT Lbs,
16-Mar-2024 17:34:25,800,FPS,25.6,FT Lbs,
16-Mar-2024 17:34:42,805,FPS,25.9,FT Lbs,
16-Mar-2024 17:34:59,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:25,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:34,789,FPS,24.9,FT Lbs,
16-Mar-2024 17:37:07,786,FPS,24.7,FT Lbs,
16-Mar-2024 17:37:21,782,FPS,24.4,FT Lbs,
16-Mar-2024 17:37:35,777,FPS,24.1,FT Lbs,
16-Mar-2024 17:37:47,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:03,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:10,768,FPS,23.6,FT Lbs,
16-Mar-2024 17:38:21,765,FPS,23.4,FT Lbs,
16-Mar-2024 17:38:30,763,FPS,23.3,FT Lbs,
16-Mar-2024 17:40:14,756,FPS,22.9,FT Lbs,
16-Mar-2024 17:40:22,747,FPS,22.3,FT Lbs,
16-Mar-2024 17:40:30,745,FPS,22.2,FT Lbs,
16-Mar-2024 17:40:37,742,FPS,22.0,FT Lbs,
16-Mar-2024 17:40:46,733,FPS,21.5,FT Lbs,
16-Mar-2024 17:40:53,735,FPS,21.6,FT Lbs,
16-Mar-2024 17:41:00,724,FPS,20.9,FT Lbs,
16-Mar-2024 17:45:32,721,FPS,20.8,FT Lbs,
16-Mar-2024 17:46:54,719,FPS,20.7,FT Lbs,
16-Mar-2024 17:47:01,712,FPS,20.3,FT Lbs,
16-Mar-2024 17:47:07,707,FPS,20.0,FT Lbs,
16-Mar-2024 17:47:24,696,FPS,19.4,FT Lbs,
16-Mar-2024 17:47:45,698,FPS,19.5,FT Lbs,
16-Mar-2024 17:47:55,689,FPS,19.0,FT Lbs,
16-Mar-2024 17:49:18,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:24,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:29,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:36,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:44,666,FPS,17.7,FT Lbs,
16-Mar-2024 17:50:02,659,FPS,17.4,FT Lbs,
16-Mar-2024 17:50:16,668,FPS,17.8,FT Lbs,
16-Mar-2024 17:50:41,643,FPS,16.5,FT Lbs,

Try adding a washer on the valve stem.
I think I added an M4 washer.

With the washer on the valve stem I am getting 6 magazines (48 shots) from 250-260 bar to 130-140 bar.
The velocity is in the 735 -770 FPS range with Daisy 7.5 grain pellets.

[Billyhill]

Thanks naptemp. I went form 6 usable shots with my jet 1 .22 to 21 shots with that washer mod.

 full m4 washer was 337 fps. used a dremel and some sandpaper and took of 50mm off the washer

shot string after

Shot No.   Velocity (fps)   Energy (fpe)   Energy (fpe)   Energy (fpe)
0   643   13.1   13.1   13.1
1   639   13.0   13.0   13.0
2   644   13.2   13.2   13.2
3   650   13.4   13.4   13.4
4   644   13.2   13.2   13.2
5   648   13.3   13.3   13.3
6   642   13.1   13.1   13.1
7   638   12.9   12.9   12.9
8   639   13.0   13.0   13.0
9   643   13.1   13.1   13.1
10   645   13.2   13.2   13.2
11   647   13.3   13.3   13.3
12   646   13.3   13.3   13.3
13   638   12.9   12.9   12.9
14   636   12.8   12.8   #N/A
15   628   12.5   12.5   #N/A
16   623   12.3   #N/A   #N/A
17   616   12.1   #N/A   #N/A
18   610   11.8   #N/A   #N/A
19   600   11.4   #N/A   #N/A
20   591   11.1   #N/A   #N/A

[miksatx]

250b shot down to 100b.

Airgun High Power, 7.9 hp

Shot count: 62

Low: 643 FPS
Hi: 844 FPS
Avg: 775 FPS
Spread: 201 FPS
STD Dev: 59.4 FPS

16-Mar-2024 17:22:43,819,FPS,26.8,FT Lbs,
16-Mar-2024 17:22:55,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:23:03,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:23:12,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:23:29,842,FPS,28.3,FT Lbs,
16-Mar-2024 17:23:37,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:23:44,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:24:32,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:20,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:26:27,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:26:50,844,FPS,28.5,FT Lbs,
16-Mar-2024 17:27:08,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:27:21,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:30,835,FPS,27.9,FT Lbs,
16-Mar-2024 17:27:45,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:27:58,837,FPS,28.0,FT Lbs,
16-Mar-2024 17:29:52,840,FPS,28.2,FT Lbs,
16-Mar-2024 17:30:03,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:30:14,826,FPS,27.3,FT Lbs,
16-Mar-2024 17:30:27,833,FPS,27.7,FT Lbs,
16-Mar-2024 17:30:58,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:31:12,817,FPS,26.7,FT Lbs,
16-Mar-2024 17:31:49,828,FPS,27.4,FT Lbs,
16-Mar-2024 17:32:00,814,FPS,26.5,FT Lbs,
16-Mar-2024 17:33:38,823,FPS,27.1,FT Lbs,
16-Mar-2024 17:33:48,803,FPS,25.8,FT Lbs,
16-Mar-2024 17:34:13,812,FPS,26.4,FT Lbs,
16-Mar-2024 17:34:25,800,FPS,25.6,FT Lbs,
16-Mar-2024 17:34:42,805,FPS,25.9,FT Lbs,
16-Mar-2024 17:34:59,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:25,798,FPS,25.5,FT Lbs,
16-Mar-2024 17:35:34,789,FPS,24.9,FT Lbs,
16-Mar-2024 17:37:07,786,FPS,24.7,FT Lbs,
16-Mar-2024 17:37:21,782,FPS,24.4,FT Lbs,
16-Mar-2024 17:37:35,777,FPS,24.1,FT Lbs,
16-Mar-2024 17:37:47,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:03,770,FPS,23.7,FT Lbs,
16-Mar-2024 17:38:10,768,FPS,23.6,FT Lbs,
16-Mar-2024 17:38:21,765,FPS,23.4,FT Lbs,
16-Mar-2024 17:38:30,763,FPS,23.3,FT Lbs,
16-Mar-2024 17:40:14,756,FPS,22.9,FT Lbs,
16-Mar-2024 17:40:22,747,FPS,22.3,FT Lbs,
16-Mar-2024 17:40:30,745,FPS,22.2,FT Lbs,
16-Mar-2024 17:40:37,742,FPS,22.0,FT Lbs,
16-Mar-2024 17:40:46,733,FPS,21.5,FT Lbs,
16-Mar-2024 17:40:53,735,FPS,21.6,FT Lbs,
16-Mar-2024 17:41:00,724,FPS,20.9,FT Lbs,
16-Mar-2024 17:45:32,721,FPS,20.8,FT Lbs,
16-Mar-2024 17:46:54,719,FPS,20.7,FT Lbs,
16-Mar-2024 17:47:01,712,FPS,20.3,FT Lbs,
16-Mar-2024 17:47:07,707,FPS,20.0,FT Lbs,
16-Mar-2024 17:47:24,696,FPS,19.4,FT Lbs,
16-Mar-2024 17:47:45,698,FPS,19.5,FT Lbs,
16-Mar-2024 17:47:55,689,FPS,19.0,FT Lbs,
16-Mar-2024 17:49:18,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:24,687,FPS,18.9,FT Lbs,
16-Mar-2024 17:49:29,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:36,673,FPS,18.1,FT Lbs,
16-Mar-2024 17:49:44,666,FPS,17.7,FT Lbs,
16-Mar-2024 17:50:02,659,FPS,17.4,FT Lbs,
16-Mar-2024 17:50:16,668,FPS,17.8,FT Lbs,
16-Mar-2024 17:50:41,643,FPS,16.5,FT Lbs,

Try adding a washer on the valve stem.
I think I added an M4 washer.

With the washer on the valve stem I am getting 6 magazines (48 shots) from 250-260 bar to 130-140 bar.
The velocity is in the 735 -770 FPS range with Daisy 7.5 grain pellets.

No thanks I’m good with 62 kill shots!

[BigE]

Those .177 magazines are way too expensive for what you get. I've re-created the 8 shot in CAD. I think I'll 3D print it and test it out. I need to find a source for the spring.


I'm thinking about increasing the shot count to 14 and doing this in aluminum.

Yeah, I know, the roto-index magazines sort of fit, but I want one that fits.

[BigE]

No thanks I’m good with 62 kill shots!

The problem that I found is that even though you get a ton of shots, because the FPS changes so much, none of them are accurate. I now get a ton of shots, but the spread is about 20 instead of 200.

Now I get a bullseye almost every time at 20 yards, from shot 1 to shot 60. OK, there are a few fliers here and there, maybe 1 out of 15, but I blame that more on the cheap pellets I'm using. Amazon has the Winchester 0.177 for $4.68 for 500 count.

[Jayrotx821]

The 33 grain Apolo Domed at 570 fps out of Jet 1 PCP.  Accuracy wise at 20 yards is giving my tried and true 30 grain HN Barracudas a run for their money.  I tried the 33 grain Apolo slugs and they were not accurate at all.

The domes may be my new favorites. 

Jet1 botttled and regged at 2800 psi

[ar6man]

I think I screwed up by trying to start a new thread asking for help replacing a broken firing pin in my Hatsan Jet 2 .25 cal pistol. I've done a lot more homework since posting that the other day, and am confident I can get the pistol apart and replace the broken 2312 firing valve pin (or Poppet as I've heard others describe this part in this thread...) in my gun. There's only one issue standing in my way...  When the pin broke, it was with a 3000psi charge in the pistol. The only way I currently know to degas this design is to continuously fire the pistol until the air reservoir is empty, but I can't do that because the firing valve pin is broken.... What's the safest way to degas this beast so that I can safely remove the twin air reservoir assembly in order to replace the firing valve pin?

This is driving me nuts... lol

Charlie in CT

[Rat Sniper (AKA: PaulT58)]

Unscrew the cover from the gauge and slowly unscrew the gauge until the air starts to leak out.  Let it go until it stops and then loosen the gauge some more.  Continue this until the cylinder is empty.

[ar6man]

Unscrew the cover from the gauge and slowly unscrew the gauge until the air starts to leak out.  Let it go until it stops and then loosen the gauge some more.  Continue this until the cylinder is empty.

Thank you!

[naptemp]

The Jet 2 has a degassing screw under the bottom of the lower cylinder.

[ar6man]

I wondered about that screw, but wound up unscrewing the manometer to degas. There's nothing about that screw that I saw in the manual... Good to know for the next time as the 2312HP pin is underdesigned, so will fail again and again...

I had asked Kadden @ Hatsan USA for a procedure to replace the firing pin, but he said they can't provide one due to safety concerns. This makes no sense! They sell spare Jet 2 air reservoir assemblies with no directions at all from what I've read online. That makes no sense either... What is up with that?? Since the firing pin is located in that assembly, and it must be 100% depressurized before being removed, there's really no reason to not show how to replace a broken firing pin... Kadden is not the best customer service person I've ever dealt with either. Not helpful at all... No matter now... I know the procedure for replacing this part... My Jet 2 is working fine again. 🙂

Charlie in CT

[naptemp]

I wondered about that screw, but wound up unscrewing the manometer to degas. There's nothing about that screw that I saw in the manual... Good to know for the next time as the 2312HP pin is underdesigned, so will fail again and again...

I had asked Kadden @ Hatsan USA for a procedure to replace the firing pin, but he said they can't provide one due to safety concerns. This makes no sense! They sell spare Jet 2 air reservoir assemblies with no directions at all from what I've read online. That makes no sense either... What is up with that?? Since the firing pin is located in that assembly, and it must be 100% depressurized before being removed, there's really no reason to not show how to replace a broken firing pin... Kadden is not the best customer service person I've ever dealt with either. Not helpful at all... No matter now... I know the procedure for replacing this part... My Jet 2 is working fine again. 🙂

Charlie in CT

Kadden sent me the parts I needed so he is OK in my view.

I remember seeing instructions on how to replace the valve pin.

These are roughly the steps to follow.

1. Degas the air cylinder
2. On the bottom there are 2 hex screws. Remove them.
3. Under the hex screws (same hole) there are grub screws.
Loosen the grub screws.
4. Pull out the air cylinder.
5. Open the air cylinder to remove the valve.
The valve is part of the air cylinder, and attached with several screws.
6. Inside the valve is the valve pin you need to replace.
7. Do the same steps in reverse.

[ar6man]

I wondered about that screw, but wound up unscrewing the manometer to degas. There's nothing about that screw that I saw in the manual... Good to know for the next time as the 2312HP pin is underdesigned, so will fail again and again...

I had asked Kadden @ Hatsan USA for a procedure to replace the firing pin, but he said they can't provide one due to safety concerns. This makes no sense! They sell spare Jet 2 air reservoir assemblies with no directions at all from what I've read online. That makes no sense either... What is up with that?? Since the firing pin is located in that assembly, and it must be 100% depressurized before being removed, there's really no reason to not show how to replace a broken firing pin... Kadden is not the best customer service person I've ever dealt with either. Not helpful at all... No matter now... I know the procedure for replacing this part... My Jet 2 is working fine again. 🙂

Charlie in CT

Kadden sent me the parts I needed so he is OK in my view.

I remember seeing instructions on how to replace the valve pin.

These are roughly the steps to follow.

1. Degas the air cylinder
2. On the bottom there are 2 hex screws. Remove them.
3. Under the hex screws (same hole) there are grub screws.
Loosen the grub screws.
4. Pull out the air cylinder.
5. Open the air cylinder to remove the valve.
The valve is part of the air cylinder, and attached with several screws.
6. Inside the valve is the valve pin you need to replace.
7. Do the same steps in reverse.

Why wouldn't Kadden have given me these instructions? Weird...

[AThomas]

Has anyone taken apart the air cylinder on the Jet 1 and if so how did you remove the end that houses the valve.

[JPSAXNC]

google, Hatsan air guns exploded view. Scroll down the list to the Jet.

[ar6man]

Has anyone taken apart the air cylinder on the Jet 1 and if so how did you remove the end that houses the valve.

I've done this with the Jet 2. With the Jet 1, I believe you'd want to start by unscrewing the air reservoir, which I believe can be done while still charged with air as its hot swappable... Next, from the bottom of the pistol there are 2 sets of screws locking the male plug portion of the air reservoir block in place in the receiver. One set holds the accessory rail on the bottom of the receiver while the other set holds the rear part of the trigger guard into the receiver. In both cases, there will be a top allen head screw and then underneath the allen screw there'll be a second allen set screw. Remove the top Allen head screws and then loosen the bottom allen set screws enough to slide out the air reservoir block. Remove the 4 allen head screws on the air reservoir side of the block. You'll be able to access the 2312 firing pin now to replace it.

[AThomas]

Has anyone taken apart the air cylinder on the Jet 1 and if so how did you remove the end that houses the valve.

I've done this with the Jet 2. With the Jet 1, I believe you'd want to start by unscrewing the air reservoir, which I believe can be done while still charged with air as its hot swappable... Next, from the bottom of the pistol there are 2 sets of screws locking the male plug portion of the air reservoir block in place in the receiver. One set holds the accessory rail on the bottom of the receiver while the other set holds the rear part of the trigger guard into the receiver. In both cases, there will be a top allen head screw and then underneath the allen screw there'll be a second allen set screw. Remove the top Allen head screws and then loosen the bottom allen set screws enough to slide out the air reservoir block. Remove the 4 allen head screws on the air reservoir side of the block. You'll be able to access the 2312 firing pin now to replace it.

Thanks information i needed.