TAC41 with Variable Mass Piston and Airbrake Cup

[DrYellowMamba]

Hi all,

I bought a TAC41 on the weekend and put a 120n spring in it, variable mass piston and airbrake cup. I didn't have much time to play with the different weights and length of the airbrake so I guessed.

I used 2 steel and 1 aluminium with the middle size airbrake.  This gave me approx 2.5j and 345fps using a .45bb

Just now on my very short lunch break I changed the airbrake to the long one to try reduce it slightly but it went down to 1.6j

What setup do I need with the different weights for the piston and length of airbrake to get 2.3j so I'm within the limits.

Thanks

View attachment 89213

 

[Tom1889]

Hi Mamba,

Did you manage to sort it? i’m looking to get my Tac41 up to 500fps.. i also have the 120 spring, variable piston and head ext