I'm in the process of adding gearbox services to my website. I've fixed and upgraded countless airsoft guns, mostly for friends and people I meet at games. With my own guns, I'm usually pushing them to some sort of limit or experimenting with new ideas. Currently most of my time is devoted to developing new upgrade products so I'm only taking on limited numbers of jobs, but I'll always offer to inspect people's guns for free to assess what upgrade, maintenance or repair work needs to be done.