My son picked up a CMMG .22 conversion kit for his AR this week $189. It was working well until yesterday when the firing pin broke. The kit has only about 300 rounds through it. I know they are basically the Ciener kit and almost identical to some of the others out there. But has anyone ever had any experience with the customer service from CMMG? Anyone else had any issues like this, either CMMG or others?