When i fill the gun with a compressor,the fill speed is very very slow, for example: when the compressor is 1000psi,the gun is 300psi, when the compressor is 2000psi,the gun is 1000psi, when the compressor is 3000psi,the gun is 2000psi, when the compressor is 4000psi,the gun is 3000psi and stop...