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For clarification, just because A1000 are budget line, it doesn't mean they're crap. They'll get the job done just fine and can handle rather heavy loads. They just don't have added features such as oil channels and stuff like that. The tolerance is also a tad bit looser, but generally, you won't notice the difference.
"Oilless" and "sintered" are different marketing names, but they are both made with a sintering process.
Area1000 does not make bearings. These are bushings - chalk it up to poor Japanese Engrish translations. These are bushings, despite whatever Systema calls them.
Regarding the spring guide, your stock one will last for no more than around 10,000 rounds (guesstimate) if you do not have bearings at either end of the spring. The first things to snap off will be the posts holding it still in the gearbox. Then all kinds of things can go funny, from the base cracking to the guide snapping clean off the base or even down the length of it. You won't get too much damage if this happens, but your system will no longer be efficient. You may cause excessive wear to the piston, piston head, and cylinder if this were to happen.
Like Groombug says, I highly recommend a silent head set.
With a spring that heavy, if you're intent on using 8.4v mini batteries, I'd recommend getting a torque up gear set. ROF won't be great, but at least you can get around 800 shots out of a fresh battery. I use to run a setup like that in my P90 for several seasons and it shot great. ROF wasn't as disgustingly high like I have it now, but it worked well with a mini battery, even through the winter season.
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