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Old 08-27-2014, 03:22 PM #1
gretch6364
 
 
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VIS Back Cap Movement

I was wondering if anyone's back cap moves up and down when they shoot. I have a new VIS with about a case through it, and I was emptying a tank to move the bonnet location and noticed the back cap would bounce up and down as I was shooting it.

I never noticed this while playing, and my magnet seemed fine, etc. I was firing into a dry full of towels with an empty hopper on and the barrel wrapped up, so maybe blowback of some kind? Maybe the two O-rings on the front of my engine need lubed?

Only things I could think of that were different. The engine didn't come flying out the back or anything, but it was coming up pretty far, and was curious if anyone else has noticed this?
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Old 08-30-2014, 10:15 AM #2
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I have never experienced this with my three VIS engined Victories, although I don't dry-fire them ether as I don't want to have issue with the pillow in the bolt. I'm not sure what to suggest.
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Old 08-31-2014, 07:41 PM #3
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Check to see if the magnet came loose in the back cap. If so, there's nothing holding it down. A little super glue will fix it right up.
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Old 09-01-2014, 12:00 PM #4
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Magnet is not loose...still pressure there
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Old 09-03-2014, 09:43 PM #5
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Have you tried with paint
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Old 09-12-2014, 05:04 PM #6
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I noticed this with my own Vis last sunday practice. I talked to numerous people about this issue including Garrett from Blast and Joel from Paintball Gateway. So I replaced both of the 006 orings on the bottom side of the engine casing with 007's. Doing this fixed the problem. Be sure to cover the oring grooves with lube before inserting the new orings, and then make sure the outside of the orings has lube on it as well.

Keep in mind that when you push the engine back into the gun, it could potentially scrape the orings. Inserting the engine with the holes on its sides and then turning it inward can help. Dan from Yourpbfriend has a video of him doing it. Click on the link below and skip to 13:05.

https://www.youtube.com/watch?v=JnXKmNRmz44

GOOD LUCK!

Last edited by T3DDYB3AR : 09-12-2014 at 05:06 PM.
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Old 09-13-2014, 03:02 PM #7
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its due to low pressure to the marker
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