Last Purchase of 2022 - .177 Winchester Model 1100 XSU

[c801tfd]

Well today I decided to take a chance on an unusual underlever air rifle being a .177 Winchester Model 1100 XSU I found at a second hand store. Cosmetically it needs some work to make the Turkish Walnut stock presentable and a good cleaning and relive of the metal parts. However, I figured for $49.50 I would not be out to much but would gain some more knowledge on rebuilding/tuning of various springer designs and manufactures.

All I know is that it marked as made in Turkey, I presume it is a Hatsan model because of country of origin and the nice gold plated trigger that you see on the Model 95 and other Hatsan air rifles. It also says it was made for Daisy located in Arkansas.

I really would like to know what the official designation Hatsan sells/sold these under and where other than Hatsan could seals and a mainspring be purchased if needed. Any advise and tips on what can be done with this type of air rifle is greatly appreciated.

Below are some pictures showing current condition and markings. So far I know it shoots but have not checked for velocity or accuracy at this time.

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2nd set of pictures

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Final set of pictures

[Toxylon]

I think your 1100XSU is a Hatsan Torpedo 155. Everything I see in your pics matches the 155. But I'm not an expert on Hatsan underlevers.

The 155 uses the same mainspring and piston seal as the H135, a 30mm seal. ARH and others make replacement piston seals for these guns, but the seals made by Hatsan are superior in these monster magnums, cost way less and are readily available.

I think Vortek makes a replacement mainspring for the H135-155, and some Eastern European companies do as well. These are likely much better quality than the Hatsan springs. I haven't used anything but Hatsan mainsprings in my Hatsans to date.

Most likely the piston seal in your gun is damaged from installation at factory, and may also be undersized, both contributing to a non-optimal shot cycle. Even if it weren't, your gun is pretty ancient (for a Hatsan), going by the manufacturing date of 2009. So, the seals are ripe for replacement anyway. I would assume the mainspring has canted and fatiqued, as well, and needs to be replaced.

Hatsans aren't the easiest of guns to tear apart, and an underlever is more involved than a breakbarrel. I have worked on breakbarrel Hatsans but have zero experience with their underlever guns. Particular tricks and tips need to be learned and heeded, like on any gun. The dismantled gun needs to be thoroughly degreased and deburred for the new piston seal to have a hope of working properly.

[mikeyb]

I think everything Duke listed is correct, plus the Hatsan Torpedo series also uses a special breech seal.
As usual Hatsan stock of these seals is currently "0".

https://hatsanairgunsusa.com/product/large-plunger-seal/
https://hatsanairgunsusa.com/product/torpedo-breech-seal-5-pack/
https://hatsanairgunsusa.com/wp-content/uploads/2018/12/Torpedo_155-Exploded_View-June2013.pdf

IMO ~$50 was a good deal, even if it requires some parts and a stock refinish.

If you do need other parts from Hatsan, use the online form and request a quote. Be prepared to WAIT!
Hatsan's response is glacial but they ALWAYS answer my requests.
Just recently requested quote for Mod95 springs and end-plugs. Response was 10 business days later with cost and available stock (not all parts were available).
Placed order for available parts. Received a response 15 business days later with a paypal invoice for parts and shipping. Paid invoice and received parts 10 business days after that.

I got spoiled with Amazon 2-day shipping (which has now devolved into 5-8 day shipping) so the wait for Hatsan response was initially surprising. I'm a big Hatsan fan and now accept the long wait for their OEM parts at what I consider very reasonable cost.

[c801tfd]

Thank you everyone for the information provided, it will be very useful as I move along in learning this rifle and bringing it back up to spec.

[c801tfd]

Took it apart, checked seals both were in good shape, the strange barrel setup locks up tight, the spring was not canted, cleaned  what May have been 13 years of gunk out of the inside, gave it fresh moly and lube where appropriate, trigger is good for now (will tinker with it if I decide to keep it) And refinished the walnut stock.

Tested velocity with old tin of 10.5 gr Crosman Premier Ultra Magnum Pellets and had a high of 961 fps and a low of 955 fps on 5 shots. I guess that is in the ballpark for this model. Next up when it is warmer - accuracy test.