KJW tend to be much higher quality than WE. However, their mags in general seem quite high-maintenance. I have the KJW M9. The gun itself is fantastic. Shoots hard and straight. It's easily seen 5000 rounds and still shoots are well as the day I got it. Other than a worn mag catch, I haven't has an issue with it. However, the mags are constantly springing leaks, not from the valves, but from their main seal. This tends to be a chronic problem with most KJW guns. Not sure about their 1911 in particular though, but no reason to think it would be otherwise, as the mags are an issue with all their other guns.
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