S410 gub screw purpose?
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=1173
Printed Date: 06 Dec 2025 at 8:54pm
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Topic: S410 gub screw purpose?
Posted By: KiwiTR6
Subject: S410 gub screw purpose?
Date Posted: 21 Feb 2025 at 2:07pm
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Can anyone tell me what the purpose is of the 3mm grubscrew below the breach block on my recently acquired Air Arms S410 Classic? I noticed it was about to fall out but none of the parts diagrams or YouTube tear-down videos show it so I have no idea what it's purpose is. I assume it locks something but it travels a long way in and I don't want to risk tightening it and doing some damage.  ------------- 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 |
Replies:
Posted By: Myson
Date Posted: 21 Feb 2025 at 2:53pm
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Hi Gavin, On my Side Lever version of the AA S410 Classic, that's where the high-low power button sits. Perhaps your button has been lost (?) and this grub screw controls the high-low power setting? On mine, turn the screw (button) anti-clockwise until it stops - that's High power (32ft/lbs). Turn it clockwise until it stops - that's Low power (sub-12 ft/lbs). Hope that helps?  ------------- https://www.youtube.com/watch?v=eq7jVyBfFqE" rel="nofollow - https://www.youtube.com/watch?v=eq7jVyBfFqE Air Arms S510 US .22 Air Arms S410 .22 Weihrauch HW97KT .177 Weihrauch HW95 .177 |
Posted By: Pauly5
Date Posted: 21 Feb 2025 at 5:27pm
| Yea, I think Myson is correct, but probably not a lost knob, but an adjustable grub screw. I suspect it will be a cone shape and adjusting it will alter the transfer port size. |
Posted By: KiwiTR6
Date Posted: 21 Feb 2025 at 6:21pm
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Thanks guys, that makes sense as the screw end is tapered. I'll play around with the chrony to determine where I should set it at. ------------- 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 |