Project Gamo Expo-26
Printed From: Kiwi Airgunners
Category: Technical
Forum Name: Pauly's Technical Area
Forum Description: Technical information, Modifications and DIY projects are all in here
URL: www.kiwiairgunners.co.nz/forum_posts.asp?TID=898
Printed Date: 05 Apr 2025 at 6:04pm
Software Version: Web Wiz Forums 10.14 - http://www.webwizforums.com
Topic: Project Gamo Expo-26
Posted By: KiwiTR6
Subject: Project Gamo Expo-26
Date Posted: 26 Sep 2023 at 4:00pm
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Well this is my $110 "bargain" recently acquired via Trademe. Being the age it is I was kind of hoping it might be a better quality instrument than the current batch, but oh no, it's just as junky as the rest! This thing may shoot OK, I didn't bother trying the iron sights with my rubbish eyesight. I pushed on and stripped it down. The moulded plastic breech block and barrel hinge were bad enough, but the plastic spring guide inside definitely confirmed its pedigree. However, it's a project so lets see what we can do with it. There's virtually no chance that cylinder mounted scope is going to work with the flexi-breech and I'm not that keen to make a new one out of steel, so a red-dot on the rear sight mount it will be. The piston is similar to the Air Chief but a bit better made. It could do with a new seal - anyone got one lying around they'd like to move on? The wooden stock is nice (marked but still nicer than the AC plastic job) and the trigger mechanism is a bit more sophisticated than I'm used to. There is some rust spots on the top of the cylinder but won't affect its performance. The spring is toast so I have a new one coming from my mates at AliExpress. I'll have to shorten it a bit, but that's part of the challenge. I've made up a new spring guide from some junk steel and a piece of stainless tube I had lying around, along with a locating washer for the seal end. The guide is quite a bit longer and will be a hell of a lot stronger than the pathetic plastic swizzle stick the factory put in there       ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Replies:
Posted By: kruzaroad
Date Posted: 26 Sep 2023 at 5:11pm
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It's a healthy addiction. Requires thought and skill. I hope you wrote to gamo and thanked them for thier poor quality, a boon for the practically afflicted.  Should be a good project. |
Posted By: RangerPete
Date Posted: 27 Sep 2023 at 2:12am
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Kiwi, do you know how old it is? ------------- Walk quietly, but carry a big stick. |
Posted By: KiwiTR6
Date Posted: 27 Sep 2023 at 3:46am
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I'm not sure of the age although I'd guess 70's or 80's. Someone more knowledgeable may let us know. ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Posted By: kruzaroad
Date Posted: 27 Sep 2023 at 4:16am
| Last two didgets on serial number is the date produced on gamo I believe. |
Posted By: kruzaroad
Date Posted: 27 Sep 2023 at 5:04am
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Well been running around Web trying to find info but can't find much. Seems to be in 600+ FPS The only date refrances i found was a mention of a 2000 model and a serial number in pic that was 98 so 1998. What has pipped my curiosity is the end of piston cylinder seem to have a removable end cap. Not something I'm familiar with. Be great for cylinder, port work for sure. 
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Posted By: KiwiTR6
Date Posted: 27 Sep 2023 at 6:50am
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That part (breech receiver?) is moulded plastic (polymer) with an O-ring to seal the cylinder and secured with two steel pins. The barrel is also encased in plastic which incorporates the breech, although the breech seal is in the receiver portion and the steel barrel end closes against it. Horrid setup! I need a new seal - any suggestions? ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Posted By: KiwiTR6
Date Posted: 27 Sep 2023 at 6:57am
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Serial number shows it as made in 96, so not as old as I thought. This one is definitely older though!  ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Posted By: J-S
Date Posted: 27 Sep 2023 at 8:51am
Lovely gun!!  ------------- https://www.instagram.com/js_airguns/" rel="nofollow - J S Airguns Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many.. |
KiwiTR6 wrote:Posted By: KiwiTR6
Date Posted: 27 Sep 2023 at 8:55am
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Sure is! And traveled well too ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Posted By: Billbobnz
Date Posted: 27 Sep 2023 at 5:43pm
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Flip your new spring guide looks sexy.... |
Posted By: KiwiTR6
Date Posted: 28 Sep 2023 at 6:02am
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The good thing for me about your $100 challenge has been that it's prompted me to finally start upgrading my 50 year old lathe and 20+ year old mill with the new tooling I've accumulated in recent years, and to use them a bit more than I would have done otherwise..... ------------- FX King 600 .22 FX Dreamline Classic .22 Diana Outlaw .22 Air Arms S410 .22 Cometa Fenix 400 .177 Weihrauch HW50 .177 Crosman 2240 Custom .22 Crosman 2250 Custom .22 Brocock Grand Prix .22 |
Posted By: RangerPete
Date Posted: 28 Sep 2023 at 9:55am
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I want a lathe 😞 And a drill press 😞 And a big ass bench grinder And a HW100 and a the damm lotto numbers! ------------- Walk quietly, but carry a big stick. |
Posted By: Billbobnz
Date Posted: 28 Sep 2023 at 4:58pm
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Hahaha It's got me into gear too. I've got sidetracked with a beeman sportsman RS2 that never had a barrel, just put umarex .177 on it. Needs a few tweaks and it should be a keeper |