[Drakker]

Maintenance on a GBBR is pretty much the same as any GBB pistol. Field strip it, in all the places you have access to, remove all the dirt and sand, clean the old lube in the area of moving parts, put new clean lube in, reassemble, and you're done. It's not all that hard, but you have to do it for every outside game where you crawl in the dirt, or every few games if you play inside in a clean place. Maybe once or twice a year, depending on your usage, you might want to do a more thorough clean up job and disassemble it almost completely and inspect and clean every single moving part then re-lube them and reassemble.