HC6

I have a SKO Shorty, two 5 rd and one 10 rd mags. Shot it for the first time earlier this week, only ran about 25 shells through it, of three different types (all meeting the minimum recommendations). Not once did it cycle completely to the follow up shot, about 3 or 4 feeding issues. Yes I understand about the so called "break in" but come on...really. I hope it improves or this firearm is basically useless. Any recommendations? Other than continuing to the "break in period"? Thanks all!