Ar scope question

[b/smith]

Just bought my first ar15 it's a a3 with a a2 front sight and removable handle
Need a scope with magnification no higher than 4 power and mounts for around $ 300 if possible I was looking at the Primary arms 4 x on line but no
Hands on that's why I want to ask the experts thanks for any advice

[8541/9999]

How much shooting do you plan to do with it in a year and do you plan to use this as a defensive weapon. What brand AR?