Mine has done that to. Go slow and easy it cycles pretty good. Go fast and it periodically jams. I put a different chassis on my 6.5 creedmoor that now uses AICS mags. Cleared up most of it but once in awhile I still get a jam. Thinks it's the way it was designed. I did pick up a 10 round mag for the 308 from savage. Still jams periodically if I go to fast. Was asking folks who purchased the stealth rifles if they had any of these issues. They say no issues. Inserting the original mags have always seem stiff to get in and stay. May get better with more usage. Have over 500 in the 308 and seems better.