Trigger adjust
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=1309
Printed Date: 11 Mar 2026 at 11:33pm
Software Version: Web Wiz Forums 10.14 - http://www.webwizforums.com
Topic: Trigger adjust
Posted By: cometa
Subject: Trigger adjust
Date Posted: 08 Jan 2026 at 4:36pm
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I have a Gamo Wildcat Whisper in .22 and the trigger is terrible. I understand ii is possible to improve them (at least a bit) with a longer sear screw. Size is apparently M2.5x either 8mm or 10mm. But I don't know where to get one. Any advice? ------------- Do I look like an idiot? Don't answer that. |
Replies:
Posted By: -Ec
Date Posted: 08 Jan 2026 at 7:12pm
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I have the same gun and yes the trigger is not great and would be interested in how you get on with this. Aunty Google has thrown up the following links that may help - both are located in NZ https://pilotpetes.nz/product/m2-5x10-in-hex-machine-screws-304-stainless-4-pcs https://nz.element14.com/c/fasteners-mechanical/fasteners-fixings/screws-bolts/machine-screws?thread-size-metric=m2.5 I just had a thought - Ron Young sells Gamos and may either have some, or know where to get them. I'll drop him and email and ask.
------------- Regards -Ec |
Posted By: KiwiTR6
Date Posted: 09 Jan 2026 at 9:21am
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HI. I've got them in s/s cap screws from 4-20mm long (courtesy of AE). I'm in Stratford and shoot air rifles at the Eltham Small Bore Club range on Wednesday and Saturday mornings. If you have anyone coming this way I can put them in a small packet for collection from there, a local dairy, servo or my home. Just PM me to arrange. ------------- Daystate Red Wolf .22 FX Dreamline .22 Diana Outlaw .22 AA S410 .22 HW98 .177 HW30 .177 Diana 340 E-Tec .177 FWB Sport 124 .177 Gamo 900 .22 Baikal IJ-22 .177 Crosman 2240 Custom .22 Brocock GP .22 |
Posted By: kruzaroad
Date Posted: 09 Jan 2026 at 3:23pm
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Pull the screw and go to a local engineering shop, engineering supply shop etc. They aren't a specialized screw, or thread. Ive did just that to extend mine. If you have the screw with you you can hold the two together so the threads sits in the grooves of each others. If they sit with no gaps, they are the same pitch of thread. You may have to cut it down. |
Posted By: -Ec
Date Posted: 09 Jan 2026 at 5:40pm
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kruza, did you do this to your Gamo? If so, did it make much of a difference? Do you remember where you got the screw from? I've got to go to either Hastings or Palmy some time early next week which would be a good chance to try my luck I did get a response from Ron- he does not have have anything for this - as he is a official Gamo service agent, he is not allowed to fit non-gamo parts to gamo guns. ------------- Regards -Ec |
Posted By: kruzaroad
Date Posted: 09 Jan 2026 at 6:18pm
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Theres an engineering supply shop in hastings off omahu rd. Fast trade. Wilson st i think. Take the screw. If they don't have it they will tell you where to get it. Yes it does. You can over lighten it very easy. Smoothing and polishing the sears helps. If you pull it apart to do sears, theres a little plastic roller that is part of what the cocking arm moves over. It will most likely fall out unnoticed so make sure you have a cloth under it to catch it. Check a diagram on line to see. I may have one in my bits and pieces but im night shift and wont get back to farm till tomorrow. It may be for something different ill have a look. |
Posted By: -Ec
Date Posted: 09 Jan 2026 at 6:52pm
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Thanks for the update - Looks like I'll be going to Hastings, probably Tuesday so Ill check it out then. I am aware of the plastic roller - it fell on to the floor the first time I took the stock off my Gamo - had to find a video on YouTube to work out where it came from LOL. I have seen some info on smoothing/polishing the sears which one person reckoned it made a big difference. One of the "longer screw" videos found an 8mm didn't make much difference but a 10mm made it dangerously light so he used a couple of small spring washers which effectively reduced the screw to about 9mm. Anyway - worth a try to hopefully get better consistency out of the Gamo. ------------- Regards -Ec |
Posted By: kruzaroad
Date Posted: 09 Jan 2026 at 7:50pm
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Ring them and see first. Dont go for the exact length,get to long and cut.or file to size. They have shim metal too. Check for any play sideways when the barrel is shut. |
Posted By: kruzaroad
Date Posted: 09 Jan 2026 at 7:58pm
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Have you got a chrono to make sure its not a piston or barrel seal leaking. If i had time id hit the farmer up for you to come out so we could go over it. But im sleeping days at the moments. |
Posted By: -Ec
Date Posted: 09 Jan 2026 at 8:27pm
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Thanks for the thought - but I know you are working long hours for the next few months. I did have a look on there web site and is says they have several lengths of 2.5mm machine screws in stock. As I will be putting my car through the touch free car wash at the Caltex in Omahu road, I'll probably just call in and see what they have. Crono is reasonably consistent 704.2 - 715.2. I really need to strip the gun down, clean and relube. I got it 2nd hand from a guy in Stratford and I have no idea of it's history. I did clean the barrel out when I got it and it was quite dirty. I have put close to 300 pellets through it and it is still dieseling after every shot. My son-in-law has a 177 gamo he bought new and it was diesling a little last time he used it but it has probably had less than 50 pellets through it. It also has the SAT - so I'll grab a few screws if they do have them as they are under $1 each and if I can make my trigger work better I'll have a look at his too. I've only shot his gun a couple of times and can't really recall much about it. ------------- Regards -Ec |
Posted By: kruzaroad
Date Posted: 10 Jan 2026 at 12:22am
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Oh hell yeah pull it apart. If its still dieseling it probably has a petroleum based grease in the cylinder and is picking it up every time you cock it. Bit of tlc will do it the world of good. |
Posted By: cometa
Date Posted: 10 Jan 2026 at 8:33am
Thank you. I'm in Opunake and I do visit Stratford and Eltham on occasion. I'll PM next time I'm coming over. ------------- Do I look like an idiot? Don't answer that. |
KiwiTR6 wrote:Posted By: KiwiTR6
Date Posted: 10 Jan 2026 at 12:58pm
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Just text me on 0275 780 780.
------------- Daystate Red Wolf .22 FX Dreamline .22 Diana Outlaw .22 AA S410 .22 HW98 .177 HW30 .177 Diana 340 E-Tec .177 FWB Sport 124 .177 Gamo 900 .22 Baikal IJ-22 .177 Crosman 2240 Custom .22 Brocock GP .22 |
Posted By: -Ec
Date Posted: 13 Jan 2026 at 5:36pm
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I went to the place kruza mentioned in Hastings this afternoon and bought 4 20mm long screws for less than $1 each and a few small spring washers. Cut one down with a hacksaw to just over 10mm and then tidied the end up with a file. Huge difference to the trigger. Very long first stage then a clean break on the 2nd stage with no noticeable creep. I may dismantle the trigger unit and polish the components at some point but will need to test a lot more first. I did find a YouTube video that went through the the process and showed where to polish the bits of the trigger unit, but cant find it right now. If I do end up doing this, I may need to either add a spring washer of shorten the new screw slightly as I suspect polishing everything may make the trigger too light. At less than a dollar and a bit of time this was way better than buying an off the shelf screw kit for the Gamo SAT as listed here .. https://www.guncity.com/gamo-trigger-job-screw-for-s.a.t.or-c.a.t.trigger-385159 For that sort of $$ you could just about get one of these which are supposed to make the trigger much better again. https://www.charliedatuna.com/GRT-4G.htm Hopefully I will get time to fully test tomorrow - Only problem is that if it is good as the first few shots indicate, I may need to get one of these ...  ------------- Regards -Ec |
Posted By: -Ec
Date Posted: 02 Feb 2026 at 9:21am
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Quick update on this .... The original trigger screw on my gun is 8.9mm long including the head which is2.1mm so an effective length of 6.8mm The screws I got from an engineering supplies store are 18mm long with a 2mm head - so 16mm of thread depth. The one I cut down is 10.7mm long, so 8.7 mm thread depth. I have since added a .7mm spring washer and am happy with the result. Still has a long first stage but much cleaner break than the standard trigger. ------------- Regards -Ec |
Posted By: RangerPete
Date Posted: 02 Feb 2026 at 9:24pm
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Just reading this thread now… Ive done this easy mod to two of my gamos and it does definatly improve the trigger, for sure 👍🏻 I got a packet of 10 of those screws for $5 from a r/c (radio cotrolled) toy shop in Hamilton. I think the ones I got and have used were 10mm. ------------- Walk quietly, but carry a big stick. |