I would not be in too big a hurry to send WPG your money. Took mine and ran. Even sent bogus tracking info. Did provide a free run around and a prolific line of B.S. Look around, I have seen originals for only a little more than his knock offs.
If you are looking for nice kits try IMA. I ordered an M1A1 kit, received an unissued unfired kit. Looking at that brand new receiver chunk perfectly sawed off could make you cry. M1A1's $495, M1's $499.