Just besure to note that the products made usually are meant for WA/WOC not AGM, some parts is not a direct drop in. Eg Stock tube, there's the WA/WOC/Prime/Firearms and there's the AGM unique, same with reciever there's couple of factions: WA & WOC, Prime, Inokatsu, AGM, King Arms. Not sure if Classic Army are unique or not.
Besides, it makes me wonder why people are still getting a AGM when JG has a better option with less problems. But for me I'd still vouch for a WOC (Recommand CQBR due to barrel length is all the same)as it gives 380 fps. If you want a more durable one, get Prime which means you have to build it ground up. And probably in the end for a really really abusivable you're gonna have to replace everything except the internal moving parts with firearms stuff.