Mmm, are you talking rifle or pistol ???

Most ANY...dot sight will work at that range/distance.
I won't recommend a cheap sight, but the "Holosun" line of sights work very well in most all situations. Sig Sauer is another good brand.
They (Holosun) have long battery life, they are tough against drop damage (MOST are not), some have a solar cells on them to work even if the battery is dead. Their brightness control is also better than most, Some are good with the brightness control, cheaper ones...are not.

Whatever you buy, DO NOT buy a sight with a dot size of over "2moa". Anything larger will obstruct the target.

Here's a decent cheaper sight -

A very good one for a rifle -

Cheaper with solar cells -

Good for rifle -

Mike
 
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