I feel ya. If I ran a GBB I'd start out with 4 probably. It helps that I have somewhere between 20-30 AEG mags haha. I pick them up when I find good deals. I've got E-Mags, P- MAGS, hex mags, MAG metal mags, and Elite Force mags. And that's just my M4 style mags haha. Don't even get me going on my SR25, AK, SCAR-H, M40A3, and pistol mags haha.

***EDIT*** I just realized I have a problem haha.

Too a degree, yes.  But you are prepared at least.  I think I'll get a belt before I get more heavy GHK Mags

Yeah it all depends on what type of game and your role. If I'm running in a recon element or more of a leadership role then I run MAYBE 4 primary mags and 2 secondary. Normally if I'm trying to get all over the field and sling serious plastic and get tons of missions I run my full combat load.

What is your "full combat load' then?

For me personally it all depends on the event. If they allow a specific number I carry that many. If they're more open to how many you can carry I try to stash extra loaded mags in my assault pack, GP pouch, or hydro carrier. I try to get the most out of experience and don't like wasting time going back to reload mags. On top of that I carry extra for teammates. But I guess to put a number out there I usually run a standard combat load of 7 mags for my primary, and I usually have 3 or 4 pistol mags. If I run my G19 I have 3 standard mags and 1 50rd extended just in case haha.

I run a gbbr and use 4+1 primary and 2+1 secondary and never run out of rounds during a regular game, but I think it's because I KNOW I'm using a gbbr and have less ammo and firepower so I subconsciously play below my potential.  I'm wondering if I had more mags, I'd be more inclined to do more/as much as I do with an AEG.