I've had a KJW KP07 for about a month now. Mine is the Blackwater edition (same thing as the normal MEU, just different trades). I haven't been able to game it yet, but I have done some target shooting and the like.
It's a nice piece. Full metal. Modern sights. The front sight is secured with a small grub screw, so it shouldn't come flying off during use. And you can upgrade/modify the crap out of the gun, since it's TM compatible.
First thing is that it is a CO2 and Green Gas gun, so you have your choice of power. Many like CO2 for this one because it is pre-upgraded with stronger springs and a reinforced (red) nozzle. I don't have any CO2 mags for mine, so I can't comment on its performance with them. KJW also recently put out a version 2 CO2 magazine with a slim base and more reliable valve, so that's another plus.
If you choose the green gas route, you'll probably notice right away that it has terrible gas efficiency. Many people complain about getting only 6-10 shots per gas fill. Pretty crappy, considering the mags fit anywhere from 24-28 BBs depending on brand. I like the KP07 because of its single-stacker style, so I went out on a hunt to fix this.
You can get a full mag of shots with a simple upgrade. Change out the stock piston head for an upgraded one. I put a Dyna Nine Ball piston head in mine and now the KJW mag that came with the gun gets 30 shots per fill, locking back on the last BB still. The Marui MEU mags I bought are even better.
If you find a US-sourced KP07 it will have an ugly extended orange barrel. I swapped mine out for a nice aluminum Nova barrel I bought from a user on these forums. It's TM compatible, so any M1911 Marui barrel will fit it.
KJW also doesn't have the best hop up rubbers, so I've replaced mine with a A+ Studio one.
Overall it's a nice gun, especially when upgraded. Also because it's pretty cheap for what it is.
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