Hey gang, I have a mech ion here that has a slight leak from the breech. Never owned an ion before. I replaced all of the orings in the body/can and on the bolt twice so far. Orings are from a large captain oring kit with the bolt sail oring from a separate random metric oring kit. Hpr is at 160 psi and it shoots 285 fps. I was thinking about buying an official rebuild kit from SP/GOG hoping that will fix it, but before I spend the $20-$25 on said kit, are ion’s a little particular with orings? I’ve been using orings from this kit for all of my other markers and haven’t had any issues. Thanks!
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Thanks Jordan, I replaced the inner and outer bolt stop, both bolt tail orings, bolt bumper and sail orings, the larger orings between the two body halves, and the two on both sides of the feedneck hole/breech and the leak won’t go away. I’ve read some various negative opinions on the color coded oring kits. Would an official SP/GOG oring kit maybe yield better results?Comment
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I have captain oring kit o-rings on my mech ion currently and there aren't any leaks (far as i can tell; hard to find a perfectly silent room in the house, but i don't hear any hissing so far). But i will say, their color-coded size chart is garbage - i had to use the size guide on my exalt tech mat to sort em. They're also not as "plump" as o-rings from some other sources, which your ion may be finicky about (i don't know how tight their tolerances were).
For reference, i'm using an Ion XE body and a stock bolt with the tail milled by stanchy.
Do you hear/feel it in the breech? Could the leak be coming from the banjo fittings/hoses below the breech?Comment
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Thank you sir, it’s definitely coming from the breech as I had it gassed up with the grip frame detached with all of the fittings and hoses exposed. I found if it stuck my finger in through the barrel threads and kinda wedged my nail between the bolt face edge and the breech around 11:00 the leak would change pitch. Anywhere else I poked and prodded had no change in the leak sound. Thought maybe one of the new orings I installed got jacked up somehow so I replaced them all again and cleaned the channels they were sitting in/sealing and relubed and it’s still leaking in the same spot
bolt looks good with no scratches/nicks.
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What bolt do you have in it?
Your description of the leak sounds like an inner bolt stop seal. I don't generally use color code orings, I get my orings from the orings store and buy black buna so I can't really comment either way on that.
Ions use a mix of standard and metric seals, so it's possible you used an incorrect seal in the bolt stop despite it looking correct to the eye.
It should be a 014-70 oring in there.Comment
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I would swap out with a different o-ring kit, then. Jordan's recommendation, or orings-online.net. I've had good experiences with both.Comment
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Thanks again guys, I believe it’s the stock bolt (it’s black). I used an 014/70 oring in the inner bolt stop but I’ll try messing with that some more. I’ll order the SP kit and see what that does if nothing else works out.
Wasn’t sure if ion’s were like automags where you should just get the rebuild kit from the manufacturer. I’ll report back if it helps anyone else out down the road. Thanks again!Comment
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Lil update, I ordered the SP oring kit but started swapping 014 orings in the inner bolt stop just to see. 4th one was a charm and sealed it up. I appreciate y’all!Comment
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Oring quality can be hit or miss. I've had issues plenty of times, including Automag factory kits - sometimes you just get a few from a bad batch and have to keep trying until you get a good seal.Comment
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