I recently purchased my first rocklock, a slightly used Pedersoli Frontier 54 cal. While waiting for the weather to clear , and after reading so much on flint types, I decided to order a few to try. I decided to try Stonewall Creek Outfitters cause I've heard of uniformity issues with flints from other places. Well SCO is a small mom and pop business where you end up talking to the proprietors directly on the phone. I spoke to Troy, who was very helpful, and he got me all fixed up. I received my order within 3 days from talking with him, every one of the dozen (6 Black English/6 French Amber) were very uniform, and all I believe to be serviceable. I'm posting this because I'm more than happy with the folks at Stonewall Creek Outfitters and wanted to spread the word.