sniper upgrades

What's going on guys just a quick question, i have a Action army Teflon cylinder with the blue 90 degree piston, i recently played a week ago and decided to clean out my gun i noticed when i put my finger over the cylinder head and shoot i don't have good compression, the pressure just exits...

Hi. I am wondering what upgrades are necessary to achieve better performance. I am currently struggling to find a precision barrel that fits, but I came across this one: https://www.evike.com/products/40493/ It doesn't say it fits the MB04 but it does say it fits the 03/07/09/10, could it also...

So I have been playing airsoft for about a year now and have only ever had one gun, M40A3 sniper. Finally getting a sidearm (it sucks to not have one FYI) and in my looking around the web for the right one have come across several sniper upgrade kits. Thinking about my gun and maybe a slight...