What barrel length do you want?
Do you have a preference for carbine or midlength operating systems?
Do you want a railed HG, tube HG, or something else?
Do you have a budget for BUIS, or would you like them to pop out of the box with them on?
Is there a reason you do not want a fixed FSB?
You have a realistic budget and enough information to get a good rifle pretty quickly.

