Alrighty first things first go check out the rules here on the forum and use capitalization in the thread title and properly in the message along with spelling.
On the gun itself I'm not sure who made those off the top of my head I know some of their guns are APS because I actually just got one in today;) I will say my experience is somewhat limited on these but I know a few kids that come play airsoft with me do have them. Overall consistency honestly sucks out of the box, fps is fine usually. FPS wise depends on what you want to use it for but I would leave it stock, they aren't built that tough internally from what I've seen and if you want to keep full auto and use it up close and at a distance I would leave it around the 350 or so FPS it is stock. Look in the mag well and see if you've got a metal gearbox in there you should if so normal v2 gearbox parts for other m4 variants should work fine for ya.
And then install that then go from there. Likely that will be a decent upgrade in accuracy and consistency enough so you'll be happy with it stock. Other than that just get used to the gun and spend some time tuning things.
xaos - "298,000 yen for a complete gun. How much is that in real money?"