where to buy upgrades online?

[Slade]

Specifically, prometheus tightbores and systema or prometheus hop up buckings. I'm hesitant to buy stuff on ebay because there's really no guarantees on what you get being authentic.

[Hal9000]

Redwolfairsoft.com

Ehobbyasia

Airsoft atlanta might have some

Asgi might as well.

[Slade]

Asgi hasn't stocked any higher-end tight bores or hop-up buckings for awhile unfortunately.

[Lancer]

I order most of my stuff from trinityairsoft.com, good prices and it located in North Carolina I believe, so most of the time it gets here the day after I order it (or even the day of, if you order in the morning).