Air Venturi Avenge-X Classic Synthetic How to replace O-Rings on barrel?

I have a new barrel for my Avenge-X in .25 they did not come with the 3 O-rings for the breach end of the barrel. I have my O-ring set that came with my gun. So I need to know how to put the O-rings on properly and which ones to choose to go with the three little slots for O-Rings towards the breach end of the barrel. Some O-Rings are different color (the smaller ones), the larger ones are black and obviously don't belong where I need the 3 to install.
 
Are you changing caliber or just installing new barrel of same caliber? If same, can't you pull old o-rings & install in new barrel? Difficult to get a concise idea of what you're dealing with. Internal barrel o-rings or external? I just went to Air Venturi home page & looked at Avenge X manual maintenance page. They don't give very specific info.
 
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Are you changing caliber or just installing new barrel of same caliber? If same, can't you pull old o-rings & install in new barrel? Difficult to get a concise idea of what you're dealing with. Internal barrel o-rings or external? I just went to Air Venturi home page & looked at Avenge X manual maintenance page. They don't give very specific info.
Thanks for trying to help. There are three O-rings on the breach end of the barrel that go into the breach at the O-rings that came off my previous barrel or damaged in the process of trying to remove them. I’m installing a different caliber, but I’m not using the caliber change kit. The outside diameter of all Max barrels are the same for each caliber.