In that situation i normally say to send the gear first, but you were even nicer and agreed to send half the money first and half when you recieve the item.
If that doesnt work out than have him do it through ebay.
And if you are using paypal, they have a protection program.
Or just back out
and ask for a bunch of info like name, address, cell # house #, facebook account
and btw the NSer looks young in his profile pic