As the others say, don't do it.
Case in point. I purchsed one before I found this website. Excellent price. Fired 34 rounds through it and the bolt broke. Sent it back to FAC and they sent me another one. When I got it I noticed that the gas tube was not straight where it comes through the handguard and then into the upper. Obviously crooked as hell. Never fired it. I sent it back to FAC and asked for my money back. After several weeks, I received my check and went and bought a Bushmaster. Here is the run down, you figure it out.
$635 Hesse AR-15
$22 Shipping to send the first one back.
$80 in gas going back and forth to SC where my brother in-law is a dealer.
$25 Non-refundable shipping from the original shipping cost that was deducted from my refund check...and 6 months, yes, 6 months without a gun and having $635 tied up with no gun.
Sub Total:$762 in costs.
Total: No gun for 6 months
Grand Total= $762 and no gun
While this was going on, I thought I was going to have to deal with Hesse. They would not answer the phone and when the answering machine would come on, I left messages. No one would call me back. They also changed their name from HESSE ARMS to VULCAN ARMS. Save yourself, time, money, aggrivation and stress and don't do it.