Specna build

[Cookie4Ever]

Hello, I want to tuning my stock Specna sa-b03 to get much better range and accuracy.

6.02 407mm Guarder tight bore
Ultimate Hu chamber
G&G green bucking
M130
16:1 gears
PJ blue neodymium motor

What do you think guys about it?

[Lee 303]

Re: Specna build

You will also need to change the cylinder to match the longer barrel

[Cookie4Ever]

Re: Specna build

I believe the one on the bottom will do the job? I have this piston since new and if i'm not wrong that's the type for 400mm barrel?
BTW. It's not the Specna gearbox on the photo.
I have blue SHS piston with all metal teeths aswell, also I'm going to change the O'rings on the heads, I'm getting sharshooter sealed nuzzle and shims.
But I don't know what grease I should use? Teflon or silicon? I don't want to get 5 types of different greases for 2 gearboxes I have, so which one would be universal for greasing gears as well as heads?