Heads up on cheap 6.8 ammo. Federal made 90 grain gold dot moving along at 2800 fps, made for jordanian and saudi forces. $12.99 a box and it shoots hair under a inch out of my 12.5" arp barrel ar-15.
http://palmettostatearmory.com/index.php/catalog/product/view/id/13720/category/63/
