Impact mk2 upgrade kit, how much?

[Powerbroker]

James, 

This is humongous! FX dealer here is selling the .30, 700mm Slug Barrel Kit (with the sleeve and suppressor). I refused because the Impact X might be too slow to push the .30 cal slug out. With this humongous one, will it push the .30 call slug properly?

Thank you and best regards.

My name is James.

My 700mm impact X has 3 other simple mods but in .30 I get 948 fps for 66 grain slugs at 150 bar. Just to test I got 1072 fps for the 50 grain JSB pellet at 150 bar. I don't use pellets at that speed.

Looks like more than capable. Thank you.