Though i havent handled the TM Hi-Capa yet, i can comment on the KJ Para it seems not all KJ's are built the same.
The only problem ive had with my KJ Para is the aim really, though you can hit the torso at some 30-40 feet, but you will have a hard time to say hit the arm of someone that is partially hidden. Though occasionally it does shoot straight, the bb's tend to shoot within a "cone" rather than a line regardless how long you take to line up your shot. They dont tend to fly in a particular direction either, kind of random left/right or so. Yeah fixed hopup, i didnt have much trouble with it with both .20 and .25's, just less range and speed with the .25's obviously.
I find the cycling nice in this, i used to have a fmu KSC Glock 23F, so compared to that its fairly good, but oviously bigger and even has a fairly good crisp kick to it. With my Para i can confortably fire off 2-3 shots within a second, and half a mag without significant cooldown (at room temperature). It doesnt do so well in cool weather though as mentioned before, not sure of an exact temperature, but below 10 or so in late autumn, early spring if you plan to use it outdoors.
Yeah there are better options for more monies, but its fairly good for the price i found it.
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