I was just wondering about Nipple thread size. I have an Italian 50 Cal Hawken, no name on it just a large capitol letter I inside a square box stamped on the barrel. I am out of town and saw a nipple that uses a hand gun primer and the thread size is 6.1 mm. Was wondering if it would fit. I hate to spend $20 and it not fit. Any help would be appretiated. Thanks.