I was always a streamlight fan until I decided to save some money and buy a surefire. So I read reviews on the SF G2X Pro series. To my understanding model A is 200 lumens and model B is 320 lumens. On the SF website the pro is $95. So I looked on Amazon and it was $67. So I bought it. When I received it, I got it with the letter D on it.i googled and googled and nothing came up. So is it a fake? It was sold and shipped by Amazon, not from other sellers. Please help?