[NAPavez96]

When I use my GBBR's, I tend to find that 6 mags works, but it also depends on your playstyle. I reccomend carrying a speed loader with you just in case.

As for the joule and FPS limits, using a heavier bb is never the solution for reducing FPS. As you stated, the energy stays the same. So you have the power of 450 FPS behind a heavy BB, such as .40, shooting indoor. Not fun at all for the other guy. The best way to do it is with an NPAS.

As for brands, I'd highly reccomend KJW for an affordable but still good GBBR, but if you have the cash, go for GHK. I have 2 KJ M4's, and I love em both. I'm looking into GHK atm for another build, as it accepts real parts easily.

As for requirements for a game, unless its a Milsim of some sort, you don't really NEED a vest or anything like that, but I do reccomend them. As I was told a long time ago, all you need to play is a rifle and eye-pro. You could show up in shorts and flip flops. Not thats its reccomended, but you catch my drift :P