Well what can I say, it was a bitter sweet day at the range. I shot my Sig m400 for the first time, this thing is awesome I did however run into a couple of problems. My biggest concern were a few FTFeed. It happened once to me and several times to each of the people that came with me. I was running cheap winchester white box and PMC and have not thoroughly cleaned the rifle, also I suspected it was an aluminum magazine but did not have time to find out since the range closed on us. Hopefully it's a simple fix. Also the hand guard got loose one me (wiggling with the ring). Other than that it was everything I expected it to be, I can't wait to go back. I have the fever!