>>62182073I bought a vortex 1-8x/30mm because it had good eye relief and only weighed 17ounces. Comparable trijicon are like 25ounces. It's still like 10inches though but if you want to shell out $2000 you can get more compact ones.
A 4x scope would be fine for 500 yards though and they will be much smaller and light weight. You wouldn't want to just use a 1x reddot at all, especially for those ranges.
Just expect to pay more for your glass than you did for your rifle. They are more of an investment and you'll probably end up changing them onto different rifles.