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Old 02-20-2014, 03:18 AM #22
MaG Adrenal1ne
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Originally Posted by pbkidminion View Post
I don't see how, considering the detents are placed on the outside of the body, underneath the eye covers.... And the detents wouldn't have much of a problem fitting correctly even if the tolerances got messed up a little where they are placed.
Exactly. If the holes where the detents come in are constantly getting gouged they then become prone to expanding which will make the dentents fit loose. While this is an extreme, it could happen.
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Old 02-20-2014, 06:15 PM #23
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If you put a lot of oil on the bolt, and play in a dusty area, it can cause breach wear. The dirt from the air/ground stick to the oil, and the friction from shooting causes the wear. In extreme cases the orings would wear out as well. Try using little to no oil on the bolt. The "worn/silver" look will not effect the performance of the marker.

Another thing that can be possible is if you put too long of screws to hold the eye plates they can tear the orings, although I haven't seen someone do this.

-Chris
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Old 02-20-2014, 08:46 PM #24
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Originally Posted by mountainviewchris View Post
Another thing that can be possible is if you put too long of screws to hold the eye plates they can tear the orings, although I haven't seen someone do this.

-Chris
Ive seen people go nuts cranking down screws and since aluminum tolerances are super thin especially in that area its a viable concern.
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Old 02-20-2014, 10:06 PM #25
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Quote:
Originally Posted by mountainviewchris View Post
If you put a lot of oil on the bolt, and play in a dusty area, it can cause breach wear. The dirt from the air/ground stick to the oil, and the friction from shooting causes the wear. In extreme cases the orings would wear out as well. Try using little to no oil on the bolt.

thats how I always lube my bolt! only one maybe two drops of PE oil for the entire bolt, I only put oil on the orings, nothing else, and only so that they look kinda wet.

The "worn/silver" look will not effect the performance of the marker. Another thing that can be possible is if you put too long of screws to hold the eye plates they can tear the orings, although I haven't seen someone do this. -Chris

the screws for my eye covers are the factory PE screws, and also I'm just getting a bit more concerned now since the wear is so significant

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Old 02-27-2014, 11:36 PM #26
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OK yes.

Taking your ego with just the bare body to a machine shop, it can be done.

But, you have to factor in that you're going to lose some space in the breach that the bolt orings rely on to get air through those holes on the front of the bolt. If I had to guess it'd be enough of a difference to lose some velocity. Mainly BC the air that was being stopped by those two middle orings will now have an escape route.

So, you have to think-how are you going to get a good seal again? Well, you could get the oring grooves milled a little wider to accommodate larger orings. Or you could get a measurement of the new inner diameter of the breech and get a new aluminum or delrin bolt made up that matches. It's a bit of a pickle.
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Old 02-28-2014, 01:19 PM #27
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Doesn't Dow 55 make orings swell a little? Maybe that could be a viable option
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Old 02-28-2014, 01:30 PM #28
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Ehh idk about that. I mean it's definitely possible that 55 could get your orings to swell enough. But if it doesn't, what I described is what you're in for. Which, doesn't mean getting a new bolt made up is extremely expensive. But it's a headache.


If you had the info on how much 55 makes orings swell in front if you, you could compare it against what a machinist would predict the new inner diameter is and go from there.
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Old 02-28-2014, 03:11 PM #29
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Having read all the comments I personally don't think there is much harm from polishing the breach yourself provided you take the marker entirely apart. the o-rings on your bolt mainly help with efficiency. Unless your breach wear is so severe you've taken off a huge amount of metal everything should fit fine. You might even buff out a burr that is causing the o-ring to break on you.

Not trying to disagree with everyone, just know from polishing plenty of DM bolts that you have a little bit to work with and your breach isn't sealing a whole lot of pressure.
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