[Marwan]

ideally if its a single band i would go with either 6.3 and 18mm, or 6.75 spear and 20mm, both deadly combinations, depending on your target...soooo from the options above, i would go with the open track in 6.5mm which is closer to the setup of maybe the seatec gabbiano...(though the gabbiano is 6.3mm)...