Brocock Bantam Sniper HR, do I have a leak?

[slcrcflyer]

I just got a brand new Bantam Sniper HR and I just noticed that you can feel a slight puff or air from where the barrel meets the receiver when firing. I took the barrel out to inspect the o-rings and they look fine. My accuracy is still consistent though, I am wondering if this is normal? I was thinking that it is the excess air escaping the shroud but, I'm just not sure... Any help will be appreciated. 

Also does anyone have a list of the o-ring sizes and hardness for the barrel and breach seal, and possibly a link of where to buy them?

Thanks a ton! 

 

[rangur1]

chrony the gun, if your FPE or velocity is within close range to the advertised, and is consistent, there probably is no cause for concern.

 

[slcrcflyer]

Thank you for the reply I plan on chronographing just hoping another owner can check if their bantam is doing the same thing.