Blowing O-rings Out Of Their Grooves
@Zahar mentioned this as being a risk and it has indeed happend to me on this very build. Back when I was using the original bushing which looked like this:
Looks like a perfect fit for an 8mm bore (or rather ~8.1mm), right?
Well, Mares designed the bulkhead for this gun to be 9mm...:
Which I think is a bit strange as that's an unneeded 0.5mm gap all around the bushing which is not healthy for the o-ring.
On top of that, as mentioned, the groove seems to not have any free space, either.
When I used this bushing in a Mirage system with a 9mm bore, the o-ring was blown off. But when I made my own bushing with a bigger OD resulting in taller walls around the o-ring, it stayed put. Not Mares' fault as it was never intended as a Mirage part but nonetheless, an 8mm bushing in a 9mm bore almost sounds like they decided to increase the bore to 9mm after having manufactured 1000s of 8mm bushings...
@Zahar mentioned this as being a risk and it has indeed happend to me on this very build. Back when I was using the original bushing which looked like this:
![](data:image/svg+xml;charset=utf-8,<svg height="800px" width="800px" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
Looks like a perfect fit for an 8mm bore (or rather ~8.1mm), right?
Well, Mares designed the bulkhead for this gun to be 9mm...:
![](data:image/svg+xml;charset=utf-8,<svg height="1184px" width="2148px" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
Which I think is a bit strange as that's an unneeded 0.5mm gap all around the bushing which is not healthy for the o-ring.
On top of that, as mentioned, the groove seems to not have any free space, either.
When I used this bushing in a Mirage system with a 9mm bore, the o-ring was blown off. But when I made my own bushing with a bigger OD resulting in taller walls around the o-ring, it stayed put. Not Mares' fault as it was never intended as a Mirage part but nonetheless, an 8mm bushing in a 9mm bore almost sounds like they decided to increase the bore to 9mm after having manufactured 1000s of 8mm bushings...
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![](data:image/svg+xml;charset=utf-8,<svg height="406px" width="585px" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)