I have a mk214, ordered in march, took ten days to get it. I took it out of the box, swapped the irons from magpul buis to troy tritiums and went to the range. I did a break in and by the end of the day I was getting rapid fire mag dumps at 50 yds with the irons in 3" groups, no ff or misfeeds. Since I have put about 200 rds through with no failures, and can get 1 1/2 " grps at100 yds with the irons. Its a fantastic piece, and I will put a red dot on it sooner or later, and that will get a better group still. I would bet with a scope it would easily be sub moa