airfish

Hello! I recently bought a TM hk45 tactical brand new from a store with a spare mag. And it can only make around 50-55 shots from one mag, and only 45 from the other and the pressure already gets lower after like 20. As i fill the mag it feels like the gas can barely squeeze through the valve. I saw in badabing review that this gun can fire over 100 shots, so i began to wonder if i got a gun with a defect or maybe TM decreased the mag volume as they did in M4 MWS? Thank You for any replies Cheers !