Fxlmpact mk2 two months old will cock but when I pull the trigger the hammer releases like normal but no air will release. Note that the regulator and bottle have air! I have shot 3500-5500 pellets and slugs through the gun since I got the gun, I had got the gun to shoot the.25 36.2 nsa slugs great. I had just got the 75yd target set up 40 shots into my group then I pulled the trigger the hammer struck but no air released from the regulator? Any ideas thanks