Stodgy Posted February 15, 2020 Share Posted February 15, 2020 Just a quick one. Maybe a stupid one. One of my hicapa 4.3 mags has starting dumping from the base o ring that seals the base of the mag to the body. I took it off and drenched it in silicone oil so hopefully it will seal again. This far no joy. But my main question is what shape should it be after i remove it as its a rectangular. All the pictures of replacements are round. My thoughts are even though I only purchased it 3 months ago it must be old because if it should be round but isn’t it’s seriously degraded. Link to comment Share on other sites More sharing options...
Guest Yukarin Posted February 15, 2020 Share Posted February 15, 2020 4 of my Hi-Capa mags have leaked from that exact o-ring, my solution was to wrap several layers of PFTE tape around it. The mags have not leaked since. Link to comment Share on other sites More sharing options...
Steveocee Posted February 15, 2020 Share Posted February 15, 2020 It's very normal for hi-capa mags to leak like this after a couple of months. I usually take bottom of, touch of silicon oil and then put back together tightening the screw down correctly. Round replacement o-rings will be fine as they should need to be stretched to fit so take on the rectangular shape. O-rings are cheap, if replacements are for example 20mm round with 2mm cross section, try also 19mm round with 2.5mm cross section. Gives a tighter fitting but thicker ring which should seal better (well it did in my mk23 mags). Link to comment Share on other sites More sharing options...
Stodgy Posted February 18, 2020 Author Share Posted February 18, 2020 Reporting back as @Yukarin said the ptfe option seems to have worked so I thank you for that. Bit rubbish that I have to resort to such a bodge but it is what it is. Link to comment Share on other sites More sharing options...
Iceni Posted February 18, 2020 Share Posted February 18, 2020 Measure the original and buy more. It's only an o-ring and it'll only have 2 dimensions. Thickness as a diameter. The internal diameter of the ring. With those 2 measurements, you can just as easily buy 50 rings as 1. Since the gun runs propane you will want nitrile or buna-n rings. EDPM and natural rubber will be dissolved.https://simplybearings.co.uk/shop/Seals-O-Ring-Seals-NITRILE-O-Rings/c19_4501_4705/index.html Link to comment Share on other sites More sharing options...
Guest Yukarin Posted February 18, 2020 Share Posted February 18, 2020 28 minutes ago, Stodgy said: Reporting back as @Yukarin said the ptfe option seems to have worked so I thank you for that. Bit rubbish that I have to resort to such a bodge but it is what it is. hasn't failed me yet so personally better imo than changing o-rings every now and then. Link to comment Share on other sites More sharing options...
Steveocee Posted February 22, 2020 Share Posted February 22, 2020 On 18/02/2020 at 20:36, Stodgy said: Reporting back as @Yukarin said the ptfe option seems to have worked so I thank you for that. Bit rubbish that I have to resort to such a bodge but it is what it is. PTFE isn't a bodge. It's a lifeblood of Airsoft weapons lol. Link to comment Share on other sites More sharing options...
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