My KWA KM4 SR10 Spring Change, And Other Mods and Upgrades

My 466th Video.
34th in HD.

Finally, after 16 months of NO upgrades to my gearbox, I took a swing at upgrades of different parts. I got more velocity than I had expected.
This video shows what has happened before I was to do a video for Xcortech. My gun shot erratically, then I found out my velocity was cut more than half! My Systema 130 spring had cracked in three pieces! I later found out in a FORUM that airsoft shops and eBay shops sold old Systema as new. I no longer trust Systema products.

The end of the video shows a new product that Xcortech had sent to me for my trial and analysis. The Xcortech X3300W. Something I know will be a huge successful hit for AEG users.