Hi there. Brand new to the forum. In fact this is the first forum I've ever joined. I was looking for some advice. I'm considering buying an upper from Captrix Arms, but I've never heard of them and can't find anything about them online. http://www.captrixarms.com/product_p/cultra.htm Anyone dealt with them? The prices seem great, but I'm a little hesitant. Any advice would be appreciated. Thanks.