Hatsan Mag tube question for our customers

badboybeeson

badboybeeson

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I have a question for you Hatsan MPA semi auto 12ga owners.
a few years ago we made some hatsan mag tubes for the MPA semi auto.
it seams that there is 2 types of thread setups.
ones were there are threads on the factory part of the mag tube that just stop before the forend.
And one where there is an un machined gap before the plastic handguard.
What we are trying to work out is which is the most common one, as we do not want to make 2.
I,m starting to think the one where there is a gam before it meets the handguard seems to be the one we see the most.
The reason we ask is, we have to machine that space In the mag tube to be able to do that.

Any help would be good.
BBB
 
I think the pump vs semi extension was visited before and Simon said the pump was different. (?)

Here's the threads on my pump. I would need a +1. Which is what I think most Hatsan pump owners would need.

 
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Yes the thread "pitch" is the same on all 12ga hatsan shotguns , just the amount of threads and "gap" before the mag cap or exstention seats against eaither the forend ( on a semi ) of the barrle (lug on a pump) a pump.
The issue is if you don't get the correct amount of threads ( too few) it will not seat to many you end up with an internal gap that means you end up with threads that the follower and spring to catch on , as well as incorect chamfer between the first thread and the bore of the mag tube.
Its not as simple as it sounds.
 
EL34/6L6 said:
Yeah, it appears my 870 mag cap fits, but is tapered so stops short. Maybe I'll have to try a 870 ???
Click to expand...

The issues also is just because it fits , if the min- major. On the threads are not correct, under recoil you could "pull" your threads , but this is more an issue on aluminum mag tubes then steel.
More likly to run in to to much or to little threads
 
EL34/6L6 said:
Why no demand for a Hatsan pump extension? The threads are that different?
Click to expand...

Lots of love for the pump guns, but all the ones I see have mag tubes on them no?
Soon as we get the MPA sorted out can work on that
I have an mpa with the threads then the gap.
But I have been to 4 gunshops this week can't find one with the threads no gap :(
And Bell lifestyles , the importer will not sell to Us..
 
I think I read somewhere on the interwebs about a guy who utilized a TacStar 870 +2 on a semi and he had to use a metal spacer to make it work...

Simon, the 20" 8+1 Escort and the 14" 5+1 Escort have full length mag tubes.
It's the 18" 5+1 Optima/Escort and MP pumps that would benefit from a mag extension.
 
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