Hatsan Jet I/II Discussion

[Rob M]

some teardown info

20221226_102555 by murphyrobert9, on Flickr

the top part of the breech and sidelver assembly comes off with 2 screws ,  very simple design

Next

the hammer assembly is pretty basic , but in order to access it , the grip needs to come off ,, this is whats seen from the top

20221226_102632 by murphyrobert9, on Flickr

this is the basic action below , pulling the tube under pressure is no problem , but takes an adult grip unless the barrel is removed forst
20221226_104319 by murphyrobert9, on Flickr

this is where it gets interesting , the valve stem is solid steel , and seats on a nhylon valve base.. so the poppet itself will last forever .. I can also tell that early on they had a problem with blowback in the hammer chamber, because they added a tiny oring to the rear of the stem,, this can be common in monoblock designs where the hammer channel has no vent

20221226_103931 by murphyrobert9, on Flickr

also noteworthy in the above photo , the plenum is TINYYYY

the hammer spring is robust , .047 wire , .322 diameter, and 36mm long.

20221226_104448 by murphyrobert9, on Flickr

2 things i determined.. ONE is that the cost analysis engineer is borderline genius , everything that can be made from a mold/composites was done so. Things like the embedded nuts in the plastic mold , thats a trick from 3d printing where you have all plastic but need a steel anchor. TWO - its like a lego set, theres nothing complex taking place inside , easy to assumble or dissasemble , everything is somewhat modular.  I didnt have a heavier hamemr spring ( like .054 wire ) but i think the results would be a mixed bag. The plenum size with tiny through passage from the tank limits velocity more than hammer force , they have that part covered.

heres the tank connection , the seal is inside the tank

20221226_103215 by murphyrobert9, on Flickr

[Rob M]

I didnt take apart the trigger since its already decent and somone else posted that pic earlier in the week. There is an external adjustment that can be used, but im thinking the grip needs to be removed to access it .

[Rat Sniper (AKA: PaulT58)]

Rob, I saw that trigger adjustment screw and it is mentioned in the manual, but I'm with you, without an access hole, it's going to be tough to get to!  Thank you for posting the tear down pics, it seems to be pretty straight forward.  Is the hammer spring a common size, like the same as a MRod or PRod?

Today I mounted the OneLeaf NV 100 to the Bugbuster so now, hopefully, I'll be able to record some shots and maybe even get in some night time sniping!  Even with all that gear, it still weighs in at excatly 5 lbs and with the shorter STO Pugio LDC, it's just under 29" long, with the stock fully extended!  Here's a couple pics of te current set-up:

[ranchibi]

Cool compact and simple platforms! Enjoy shooting them!

[Rob M]

its most similar to a 2240 hammer spring , but .010 larger o.d , and far stronger at .047 wire compared to a 2240 which is .035 ish. Mcmaster would be the place for a stronger spring , but im not sure its worth it given the fixed plenum size of 2-3 cc .

[Rat Sniper (AKA: PaulT58)]

Cool compact and simple platforms! Enjoy shooting them!

Thanks Randall!  Hard to believe it's still only 5 lbs, even with all that junk hanging off it!

its most similar to a 2240 hammer spring , but .010 larger o.d , and far stronger at .047 wire compared to a 2240 which is .035 ish. Mcmaster would be the place for a stronger spring , but im not sure its worth it given the fixed plenum size of 2-3 cc .

I think I agree with you.  Since mine had no probem taking out a fairly large rat at 17 yards, I think I'm going to leave it bone stock...   For now! 

[magicmatt]

Well I think I found something out with my gun. It doesn’t like moderators, I polished the barrel again also I polished the hammer and hammer spring. I took off moderator and shot 14.3 crosman premiers and the groups were not bad at 13 yds. The gun cocs so much nicer after a polish so I tried jsb 18.54 and not so good. Not gonna give up!! I think the mod is not lining up properly no matter which one I use. It might be because “ the shroud that covers the barrel” is not square so to say or the thread in the shroud is not square.

[Back_Roads]

 Matt try an oring on the threads of the LDC if that is possible. Tighten just enough to begin to crush the oring, that may help with alignment, that or custom brass washer etc..

[Rat Sniper (AKA: PaulT58)]

Matt, what moderator are your using?  Have you tried another one to see if it's the moderator or the shroud?  What adapter are your using to attach the moderator?

I have tried a couple different moderators on mint using a DonnyFL adapter and so fr 2 of the 3 I've tried had no impact on POI, one did! 

[magicmatt]

I have to go back to work tomorrow but the next step is gonna take barrel and shroud off and re align off the gun and look thru the barrel with shroud and moderater on and see what it looks like. I will try every ones suggestions. Thank you guys!I really like this gun, short sweet and simple!

[Rat Sniper (AKA: PaulT58)]

The Hatsan Sortie Magazine arrived today, and I can verify, it does work in the Jet!  In fact, it even works with a scope and the iron sites!  It's only 4 more rounds (10 v. 6), but even those extra few rounds before having to swap a magazine are nice.

I did play with the front site adjustment some, but it is finiky!  I need to place it in a sled on a bench and use a punch and light hammer to gently nidge it one way or the other to get it truely centered.  Trying to push it back and forth with my fingers does not allow for very intricate adjustments.  But I did get it closer.  That's a 2" target shot from 20 yards.  Without the scope and camera, this thing is unbelievibly light and easy to maneuver!  The STO Pugio LCD is also very lightweight and compact, while doing an excellent job of silencing the bark!  Better than the longer Air Impulse I had on it!

[dan_house]

It doesn’t like moderators

Might was clipping the end cap.... retightened it on the adapter, the retightened on the gun.   Wondering if maybe it needs tape or such (like the Diasy 880s do) on the end of the barrel to snug it up and center it. the O ring does seem to help

or maybe the can is too long,,,, its the custom made one for my Sentry (which didnt work... long and different story for another post) at 8inches long.... is quiet though

[Rat Sniper (AKA: PaulT58)]

Well I'm completely out of the H&N FFT's until my order arrives from Hatsan!  But, I did try some AA 25.39 grain pellets and while the velocity was lower, the FPE was a foot pound higher!    Here's a shot string from the 10 shot Sortie magazine:

Shot count: 10
Low: 554
Hi: 578
Avg: 570
Spread: 24
STD Dev: 8.0
564
575
574
578
578
575
572
566
562
554

Here's video of a 6 shot string, shooting the AA 25.39 gr pellts at 17 yards.



Below is a different 6 shot string with the AA Pellets, same distance.

[dan_house]

One gripe so far.... the fill nipple seems to be oversized, and Im fighting with it to get the air hose connector on the nipple.

have sanded a little, filed a little and have got it on, then fight to get it off.... ah new gun issues

[Rat Sniper (AKA: PaulT58)]

One gripe so far.... the fill nipple seems to be oversized, and Im fighting with it to get the air hose connector on the nipple.

have sanded a little, filed a little and have got it on, then fight to get it off.... ah new gun issues

Are you using the female foster fitting that came with it?  The one I had on my compressor hose was too small to fit the fitting on the gun, so I swapped it for the one that came with it and have no problems now. It’s a much nicer fitting as well, so no complaints here. It also fits all my other guns as well, that’s a plus! 

[dan_house]

One gripe so far.... the fill nipple seems to be oversized, and Im fighting with it to get the air hose connector on the nipple.

have sanded a little, filed a little and have got it on, then fight to get it off.... ah new gun issues

Are you using the female foster fitting that came with it?  The one I had on my compressor hose was too small to fit the fitting on the gun, so I swapped it for the one that came with it and have no problems now. It’s a much nicer fitting as well, so no complaints here. It also fits all my other guns as well, that’s a plus! 

Ok thats what I was wondering. SO I'll swap that one on and stop dinking with the fill nipple...

[Rob M]

you guys have american made fill whips ( hahahaha dont you know everyone cool has china fill whips now )
the difference between 5/16 and 8mm is the issue .

[magicmatt]

I think I made some progress, and I’m probably too picky for a $330 dollar gun. After realigning the barrel and “shroud” and using the fx mod and the crosman premiere 14.3 I got this tonight 26 shots over all only 22 were recorded on fx chrony at 13 yards indoors. A side note I moved the barrel all the way up to the threaded part on shroud but when doing so the mag is loose and does not stay so I had to hold the mag during each cycle I will try and put barrel back and see what happens.

[magicmatt]

I think I can live with that lol thanks Paul for the tip on the sortie mag it works great!!

[2K1TJ]

some teardown info

20221226_102555 by murphyrobert9, on Flickr

the top part of the breech and sidelver assembly comes off with 2 screws ,  very simple design

Next

the hammer assembly is pretty basic , but in order to access it , the grip needs to come off ,, this is whats seen from the top

20221226_102632 by murphyrobert9, on Flickr

this is the basic action below , pulling the tube under pressure is no problem , but takes an adult grip unless the barrel is removed forst
20221226_104319 by murphyrobert9, on Flickr

this is where it gets interesting , the valve stem is solid steel , and seats on a nhylon valve base.. so the poppet itself will last forever .. I can also tell that early on they had a problem with blowback in the hammer chamber, because they added a tiny oring to the rear of the stem,, this can be common in monoblock designs where the hammer channel has no vent

20221226_103931 by murphyrobert9, on Flickr

also noteworthy in the above photo , the plenum is TINYYYY

the hammer spring is robust , .047 wire , .322 diameter, and 36mm long.

20221226_104448 by murphyrobert9, on Flickr

2 things i determined.. ONE is that the cost analysis engineer is borderline genius , everything that can be made from a mold/composites was done so. Things like the embedded nuts in the plastic mold , thats a trick from 3d printing where you have all plastic but need a steel anchor. TWO - its like a lego set, theres nothing complex taking place inside , easy to assumble or dissasemble , everything is somewhat modular.  I didnt have a heavier hamemr spring ( like .054 wire ) but i think the results would be a mixed bag. The plenum size with tiny through passage from the tank limits velocity more than hammer force , they have that part covered.

heres the tank connection , the seal is inside the tank

20221226_103215 by murphyrobert9, on Flickr

Thanks for the pics, Rob. As you said, looks like a  lot of composite material was used. Does it seem like a strong material? Did you see anything critical that you think they should've used metal for?

Is the reservoir adapter removable? Just curious if it would be possible to make a plenum spacer for it to up the power a touch.