Armored Core: Last Raven

While in the garage, press Triangle to display the stat you're curious about. Then press the Select button (on the controller), and highlight the stat in question. This will not tell you everything, but it is very useful and will answer questions you didn't even know you had.

It looks like the higher the number the greater performance you will do.. Parallel sight : no idea... but it got something to do with your screen spec... maybe

Parallel sight means how big your "lock box" (been playing AC on Xbox, this is a novelty to me now) is when you use two arm guns instead of classic right arm gun/left arm blade. It isn't something I ever used to notice, since I only used one FCS, but you should test it out and find the best one for you.