Spend the moolah and put on an auto-awake 4-5 MOA dot that is standard AR height.
Forget the sling for home defense, it will just get in the way.
Put on a blast shield or "fake" suppressor, or get a suppressor.
Have ear muffs ready.
Train and get it broken in with 1K rounds before trusting it for a HD role.
SOAP BOX WARNING.
STOP READING NOW IF YOU DON'T WANT TO BE LECTURED.
A lot of folks think they've spent enough money on the gun and want to go cheap on the sights.
Thats fine if you have good irons and are good with them, when you NEED them. But the reality is a lot of folks aren't, and even worse under stress or low light conditions. The optic, particularly the dot, was designed to remedy that situation. The thing you are paying for is quality and durability to get reliability.
So what are you going to pay to get the best? As the old saying goes, expect to pay as much for the optic as the rifle. This makes sense when you consider that you aren't going to be as effective without one. But we are talking dots here, so fortunately, there are good HD dots to be had in the $300 range.
Think of the optic as the weapon, since you aren't going to hit anything without one.
Soap box over. It is now safe to return to your forum.
And, welcome to RDB world.