Originally Posted by jordan7831
Some times KWA parts are wayy cheaper than buying a replacement from other airsoft stores. For instance a hop up and ball is only $5 from them. Or in the case of my P226 i needed a very specific spring that ONLY they had in stock. Only downside is that you need to call them long distance to order.
Those sound like proprietary parts, and yes it would be a good idea to get those from KWA.
For everything else that's standard like gearbox parts, aftermarket will probably be better.