Back to the topic of the M14, I've got myself a G&G m14 and had a buddy of mine replace a few internal parts, like the copper connectors which used to be thin copper slips, are now thick copper PLATES, among other modifications made. In short, Corey made it so that, if I was so compelled to, I could rig up my M14 to a car battery and not hurt the weapon.
While the G&G M14 has a few problems, it's really not that bad a gun... Just really requires some customization to work right, I suppose- I've never had any problems with my M14 personally, but ya know- maybe I just got lucky.
-Mongoose