AEA O ring info for rifle AEA Challenger

Good morning, can someone help me? My little son isn't that strong and he gave a double feed. Two slugs
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entered the barrel. The 6.35 AEA Challenger PCP rifle fired and the O-ring burst. Could someone tell me what size, thickness, and strength I need to buy it? I would appreciate it. Have a great day.
 
Good morning, can someone help me? My little son isn't that strong and he gave a double feed. Two slugsView attachment 587433View attachment 587434View attachment 587435 entered the barrel. The 6.35 AEA Challenger PCP rifle fired and the O-ring burst. Could someone tell me what size, thickness, and strength I need to buy it? I would appreciate it. Have a great day.
Best thing to do would be carefully remove it with a pick and measure the o ring with digital calipers. You can get a pair for under $30 on Amazon. O rings are listed by Inside diameter, and thickness ( also called cross section) . Usually 70 durometer.