Update!
Haven't played since Wounded Warriors, but I've got some pretty sweet gear upgrades since.
First up... the A5! After C4C I decided I didn't really like the stock and long barrel, they really make the gun huge and rather hard to wield for my run-n-gun style. So I removed the stock and now have a "Shorty Apex2" courtesy of ManWithAGun over at A5OG. I also upgraded to an X7 hopper for a little lower profile. Haven't played with either yet, but I'm excited to try them out... Also notice the sling clip on the endcap. Homemade 1pt sling with 1" nylon webbing and a couple clips and slides (I was using it just as a loop around my shoulder at Wounded Warriors, but I have now converted it to attach to my vest, which you will see in a bit.)
Oh, also. I fried my eGrip board. I got the previously mentioned battery harness all prepped and it was working great, until I went full auto for about 30 seconds and the board started smoking, lol. I'm about 99% sure the battery didn't cause this, but the full auto for so long did. I contacted WAS and then Tippmann (as WAS sold it to them) and Tippmann ended up sending me an HE eGrip to replace my older style one for only $50. (I sent in the old eGrip and the new one was a "warranty upgrade")
I don't have the new eGrip installed yet as I'm not totally sure if I want to use the eGrip or just sell it and upgrade to a double trigger and go semi auto. The FangT trigger Kyle recommended previously looks amazing.
Next, the vest upgrade!
I bought the same vest as Picklz, same eBay auction. Then I bought a handful of Valken V-tac molle attachments for it. Currently have a pair of 2+3 pod holders on the lower back, a horizontal tank holder in the middle back, and an admin/ID pouch on the lower left front. The ID pouch was going to be my battery pouch for the remote battery idea, but since that's currently up in the air, I've moved it to the front for now. You can also see the sling attached to the shoulder straps of the vest. It's got a fair amount of adjustability at each side so I can adjust how high the gun hangs too.
As an aside... Walmart carries some webbing accessories in the camping section. Selection seems to vary slightly by store, but at the EP store I found a "kit" with 6' webbing, 1 clip and 1 slide for about $2, and then you can get a pack of 2 clips and 2 slides for like $0.58. That's enough to make yourself a decent 1pt traditional sling, or something like I've got that attaches to the vest.