This allows you to attach a battery other than the 7.2v micro battery that comes with the gun. if you want to upgrade the internals of your mp7 you want to get this as well. personally I replaced the mini plug with a large one then attached an 8.4v large battery. I used a M4 stock battery pouch and just strapped it directly onto the gun. Now it goes through a 50 round clip in about 1 second, I am not exaggerating.
fairly easy to assemble
works flawlessly (just don't get the wires crossed if you replace the plug)
a little overpriced for what you get (I mean it works, but 35 dollars!)
could come with a optional large plug
I give it a 5 because there is nothing wrong with it other than the slightly inflated price
Disclaimer: All airsoft guns are required to have the tip (1/4 inch) of the barrel permanently colored in blaze orange. No person may openly display or expose any imitation firearm (replica firearm), in a public place. The term "public place" means an area open to the public or exposed to public view and includes streets, sidewalks, bridges, alleys, plazas, parks, driveways, parking lots, automobiles, whether moving or not, and buildings open to the general public, including those that serve food or drink, or provide entertainment, and the doorways and entrances to buildings or dwellings and the grounds enclosing them. Any person who changes, alters, removes, or obliterates any coloration or markings that are required for by any applicable state or federal law or regulation, for any imitation firearm (replica firearm), or device in any way that makes the imitation firearm (replica firearm) or device look more like a firearm is guilty of violating the state or federal law. By accessing the Site, you certify that you are older than 18 years of age or the age of majority where you live, whichever is older; that you are the owner of any credit card used to purchase on items on the Site; that you are familiar with all local laws in your area affecting your legal right to access airsoft products; that any products you buy are for your own private enjoyment and that you will NEVER share these products with a minor in ANY WAY.