I went with the fixed stock because that's the AK look I like best. I don't care much for anything with a collapsable stock, really. I swapped the sliding stocks on both my HK416 and MP5 with full stocks for that very reason. So I think for me, it would be the 'better gun' in both feel and function. I don't regret my choice at all. And the gun is still compact enough IMO that I could use it in a CQB situation, although for that, the 56-1 would be better.
One way or another, my Type 56 is more of a collection piece than a gaming gun, which is why I didn't bother upgrading mine. I've gamed it 2 times briefly, but don't see myself slinging an AK when I can have my preferred Armalites and MP5 instead. While I love the look of an AK, its ergonomics leave a lot to be desired.
As for a spring, it depends what velocity you're going for. I tend to install the Prometheus MS110SP in my guns. It produces a nice 360-370 fps velocity, and with a tightbore, it brings it up to the 380-390, which is perfect. The Type 56 has a 6.05 mm barrel installed stock (I'm pretty sure that's what I read somewhere) vs a regular 6.08 barrel you usually get on a stock gun, so that should put the gun in the 380 range.
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