I had a G&P 30mm AP Red Dot Sight and was not a fan of it at all.
I then tried my friends Aimpoint T1 on my ex-MP7 and it was amazing for cqb. Will try to borrow it again for next outdoor season, typically I use iron sights.
Truthfully I find that optics are based on personal preference.
Frog lube does wonders, add a few coatings and your gun is smooth as butter, also a minty smell. Make sure you apply heat before or after to the frog lube, so it can be worked in.
meaning the metal parts, some people apply it to the plastic, but I stick with 30wt silicone oil for that.
Also, check my sig.
Also, welcome to the wonder world of GBB's :P
G&P does look good, but not for me.