Hatsan/semi auto gurus, what is causing this malfunction?

I had the exact same problem with mine except I think it was my own fault!
Did a 'deep clean/strip' and must have omitted to put it back in correct way. Took the gun to our local 'gunsmith who charged me £15 to 'stone a burr smooth which achieved nothing but prove he was incompetant! made no difference at all.
I fully stripped the gun and eventually found the guilty part not quite in the right place.....sorted.
It's a great gun for pigeons and rough conditions...people knock em but I love mine😁👍
 
One of the biggest problems with these guns is they need regular good cleaning. Strip right down and clean off all the carbon. Get into the nooks and crannies with a paint brush. Don't be afraid to wash it out with boiling water to get the muck out. Dry it well obviously and lightly oil after. If you don't fancy boiling water blast it with one of those computer air can things or WD40.

They don't like to recycle anything under 70mm but I see the original post has a 70mm cartridge in or I would have thought that's the problem.

Maybe try a different cartridge, different make see if it has any effects. A good gun should easily recycle 24gram x 70mm.

As another thought, has it been dropped or banged causing some minor damage not easily seen.
 
Just had a look at these, might treat myself. Need a shotgun for rough shooting and these seem to tick the box.

The Franchi is light, points beautifully and even with heavy 3” wildfowling loads, minimal recoil. Struggles with very light 21gm loads, but no need to use those given lack of recoil. 24 and 28gram loads work well.
 
Thank you for the help, as an update I have received the parts mentioned before from @Tam the Gun very kindly ordering and posting them to me. After disassembling the gun, drifting out the pins, removing trigger mech and replacing the plunger + spring on the magazine cut off I reassembled the shotgun to find it STILL had the same malfunction...

Not one to be deterred I disassembled it again and got my other Hatsan disassembled to compare against the offending shotgun. I noticed the bolt movement on the offending shotgun was choppy. I took apart the bolt, cleaned everything internally and externally, polished the mating surfaces of the bolt and the bolt carrier, applied a film of oil and now it works flawlessly. Poor old girl worked herself dry!

If a problem seems unsolvable, it's often the most simple thing going wrong eh? Lesson learned
 
Thank you for the help, as an update I have received the parts mentioned before from @Tam the Gun very kindly ordering and posting them to me. After disassembling the gun, drifting out the pins, removing trigger mech and replacing the plunger + spring on the magazine cut off I reassembled the shotgun to find it STILL had the same malfunction...

Not one to be deterred I disassembled it again and got my other Hatsan disassembled to compare against the offending shotgun. I noticed the bolt movement on the offending shotgun was choppy. I took apart the bolt, cleaned everything internally and externally, polished the mating surfaces of the bolt and the bolt carrier, applied a film of oil and now it works flawlessly. Poor old girl worked herself dry!

If a problem seems unsolvable, it's often the most simple thing going wrong eh? Lesson learned
Thank for the update. I have three of these, they have over the past 2 seasons fired many thousands of rounds 32gm up to 63gm with only one issue, the cocking handle broke on one and I need to find a replacement However its nice to see the issues that can happen.
 
Polishing were the bolt slides over the bolt carrier, made a huge difference to mine, a few minutes with an Arkansas stone and you could feel/hear the difference. It would cycle 1oz cartridges then.
 
Thank for the update. I have three of these, they have over the past 2 seasons fired many thousands of rounds 32gm up to 63gm with only one issue, the cocking handle broke on one and I need to find a replacement However its nice to see the issues that can happen.

It's my understanding that Hatsan had a bad batch of cocking handles. Apparently they where manufactured slightly wrong causing the handle to wobble slightly and therefore break after slamming forwards several thousand times. If you get in touch with Edgar bros or Hatsan, serial number etc they can supply you with the correct upgraded part (FOC). The retaining pin is located approx 1mm different. Not obvious to the eye, but stands out like a sore thumb side by side. I have no idea of the serial numbers affected but I "think" it's the ones with the knurled round handles dating around approximately 5 years ago.
 
Seems like they disassemble of their own accord.

Sold mine after about 6 months, it let me down too many times.
No one wants a “One shot auto” but some people end up with one, happy with my Benelli for pigeon shooting no gas ports and cylinders to clean
 
No one wants a “One shot auto” but some people end up with one, happy with my Benelli for pigeon shooting no gas ports and cylinders to clean
Apples and Pears, Benelli and Hatsan, like so many shooters who just wanted an inexpensive shotgun for a bit of rough shooting, only to be disjointed with the reliability of the Turkish made Hatsan, mine had a clear indent in the barrel where it had parts welded on the externals then of course the not cambering cartridges.
 
Actually oiling is the main issue! It collects combustion material and slowly turns to a sticky paste.
I run all my automatic guns dry. There really is no need for it. Mechanically there is little going on.
Keep them dry and no sticky sludge can form.
My hatsan struggled with cartridges shorter than 70mm but it was a simple fix. The cartridge lifter just needed spreading a fraction the end nearest the chamber.
No more issues with 65-67mm cases.
 
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