100yard(约100米)之内,铁瞄或者红点。
铁瞄有正上和歪脖子2种
http://www.amazon.com/Flip-Front-Rear-Back-Sight/dp/B007D3P994/ref=sr_1_9?ie=UTF8&qid=1423362951&sr=8-9&keywords=ar+15+sight
http://www.amazon.com/Advanced-Optics-45-Degree-Transition-Backup/dp/B006X9DLQM/ref=sr_1_5?ie=UTF8&qid=1423362951&sr=8-5&keywords=ar+15+sight
红点种类更多,amaon去搜“red dot”,入门级别,50 - 100刀都可以接受
100 - 200yard(约100 - 200米),红点或者1-4倍瞄准镜。
300yard以上,这枪不胜任,估计你用不到。