Which drop will fit on my gun?

[paintbattler]

hey i was wondering what drop would fit on my gun. I dont have the benchmark anymore. i am looking into a shocktech but i don know which style to get. i dont have updated pics but i drew in about where my forgrip is. i dont know which one will fit under it. Please i need to know
*EDIT* Pic below

[paintbattler]

srry that u have to download it but it seems not to work any other way

[RT_Luver]

medium or whatever shocktech

[Ultimator]

So everyone doesn't have to download it ....

[paintbattler]

so, what yall think??

[FutureMagOwner]

i think you should get a longer one because i dont think a z would feel very good with a tank possibly in the way