sniper1185 wrote:have big different between different brand even these are same model??
If your question is,
"Is there a big difference between these brands, even tho they are the same?" then I think the KJW M9 uses slightly different parts than the KWA, but otherwise should operate the same. I personally own a HFC M9, which I have heard is almost identical part wise to the KJW one, and I love my M9. The only problem I have which I am fixing atm(soon as a part arrives), is the trigger spring is about to break, which is a normal thing for nearly all airsoft M9's at some point in the guns life. Other than that, I think the gun is great. When it comes down to it, what you pay for between brands is the quality of the parts, the metals, and the craftsmanship of the weapon.
A quick search on Google brought me this
http://www.airsoftanswers.com/gas_airso ... s-kwa_5617
After a short read, The KWA shows to be the most accurate, but the HFC, and KJW showed to be the most reliable.