Be wary of some of the AGM M14s, apparently many of them have backasswards wiring, and matching backasswards wired batteries. So you can only use the battery that comes with the AEG. To me this was a large unconfirmed rumor but when it comes to lower end asian cloned airsoft, its never to terrible to be true. Even if it was true, rewiring is not that hard.
"Its only a little bit on fire"