hey guys, i have an arrow arms ar15
http://www.arrowarms.net/aarms/index.php?cID=139
have had it over a year but have only shot it about 2-300 rounds, i havent collected my brass until a couple days ago and noticed these dimples right about halfway up the case, my other ar does not do this and couldnt really see what would be causing this
http://s998.photobucket.com/user/nwa...04670948781451
any ideas?
i will also post this in the reloading forum
thanks for any help