Ok, got this lil guy off the classifieds here and I'm wondering what it is. Was advertised as a 901, I have 901's and a 905 mod. This thing has male threads on the atty, like a 510, but they are not nearly as finely threaded and are slightly larger in diameter. It's outside assembled deminsions are almost identical to a 510, about 1/8 inch longer overall, and the cart is more like 510 than 901. It's black with red LED and the box has 901 written on it.. so what gives? Anyone know? and before I take it out and use it (it's brand new) I wanna know if I will have problems getting atties for it and such...