I bought these a couple of weeks ago off this sight. They were advertised that these would also hold 30 6.8 SPC rounds. I was going to do a 6.8 AR, but changed my mind. Please note, these are not made by Precision REFLEX Industries. These are from Precision Industries in LA Ca. I have not used these at all, but the person I purchased these from stated he had no problem with the function of these. SPF.