For the price, this thing is unbeatable. But in my Aug, when the only choice for batteries is either a $50 custom Nimh from Airsoft GI or Evike, or a $10 LiPo, clear choice being the 11.1 LiPo, these contacts will be destroyed. I would only get these contacts if you plan to use a MOSFET circuit in your gun.
Other than that, these are phenomenal trigger contacts.