WE PDW Open Bolt: Instaling Ra tech Npas Kit on
 

Hi guys

So I just picked up an NPAS Kit for my We PDW Open Bolt and I'd like some advice before attempting to tamper with my gun.

http://en.ratech.com.tw/product/teaching/teaching_5.php

Looking at the guide it seems soo simple but honestly I have no clue how much I need to file down the top portion and how wide the cross notch is suppose to be. Tells me the depth but not the width.

I also don't know how to adjust FPS either.

If anyone can clear it up, I'd really appreciate it.

Cheers
S