Help on angel volumizers

[tippmanKILLENyoMOMMA]

I have an Angel ir3 on the way and i was wondering what the volumizer is? I see you need two. What size do you need because i saw a gun with 2 different sizes. Also what is an LPR?

[Doorman]

The LPR is a low pressure regulator. This turns the pressure of the gas down to a low level which allows the marker to actuate properly.

The volumizers are there to hold extra gas to help prevent shoot down. This is especially helpful with low pressure markers.