I like the KWA over the KJW. Here goes:
With KJW there is a much higher rate of SIG replicas that use way too much gas, or don't work properly, or don't seal gas in. Some work, some don't. Even when working right, the KJW replicas aren't as gas efficient as the KWA.
KWA has better parts support and has a better finish by far than the KJW. The gun is assembled better.
Both have a working decocker, and as to the hammer wobble: The real SIG does not let the hammer sit on the firing pin. When fired, it drops and resets backwards slightly. When decocked, it does not sit all the way down. The KWA replicates this, but due to the tension on the hammer of an airsoft gun (light) there is some perceived wobble. The KJW does not replicate this.
Jester wrote:KWA P226 PTP Cons:
-Hammer spring doesn't allow it to return fully down
-Slide is aluminum, and is very light
-Outer barrel is polymer with no metal aftermarket replacement
-Some of the parts appear to be made of inferior metals (take down lever, mag lips)
I addressed the hammer spring. Up to you to like it or not, it is what it is.
The slide is aluminum, and thus the gun uses less gas during operation, and has a faster cycle rate, even if the felt recoil is lower.
The outer barrel is polymer because of the higher natural lubricity of polymer over metal. The barrel is slicker and moves easier during operation, meaning less gas used and less hang-ups overall.
Yes, some parts on KWA pistols break. However, parts will break on KJW pistols as well (valve knocker). The difference is, KWA usually fixes or reinforces or changes material when a common part breakage becomes known. Also, replacement parts are easily available. I'd be curious to see how the mag lips broke. Was it dropped? Bent and put back in place before?
KWA mags are expensive, but they tend to have a much much lower leak rate than other brand magazines, especially in the long term. If you want to pay less, buy KSC System 7 compatible mags, but combine them with an overseas order to save on shipping.
Really, I put all my experience behind KWA as the best gas pistol manufacturer with metal pistols (not arguing against TM right now, different target/class). I put them over WE and KJW and whoever else makes gas pistols in the market right now.