A couple of weeks ago I purchased a refurbished AV Avenger rifle for $249.99 thinking that was a good deal saving me $100.00. The first rifle I received had a bad air leak, I filled it to 300 bar and a couple of hours later it was down to 100 bar so I returned it and exchanged it for another one. The second gun shows signs of use while the first one looked like new but the second one is a awesome shooter. My question is about regulator creep. When I received the gun the regulator was at 2200 psi, I was out shooting the gun today after filling it to 300 bar and noticed the regulator was down to 1900 psi. Is this something I should worry about? My Avenger bullpup is set to 1900 psi and never moves unless I adjust the regulator.