I got a new Rock River Arms LAR-8 .308 on Friday and took it to the range. I shot 20 rounds of Remmington 150 gr. .308 WIN and 20 rounds of Hornady Match .308 168 gr A-Max. Out of the 40 rounds I had 8 rounds that got cocked in the chamber during feeding. It looked like the tops of the rounds were hitting something as the nylon stips of the Hornady's were scraped off. I have enclosed a picture of the 8 rounds that jambed. Took it back to the store today where it was dissasembled and nothing looked amiss. The store said it may be a magazine issue. I will try it again in a couple of days and see if it gets any better. I also sent an email to Rock River Arms to see what they say. Will keep everyone posted on the issues.