Bought a TD Arc Mag for my Rock River Arms Carbine ultralite the other day and took it out for a test run. Within the first 30 rounds I had three FTFs and I have literally had 1 ftf or fte with this gun since I have owned it using CMI mags and I am pretty sure that was from a rotten reload I must have let slip through. Has anyone else had this problem? Total disappointment, anyway I picked up a couple pmags and will see how those go the next time out. If they don't work either I guess I will stick with CMI. Take Care.