big89Hiiiii Guys!!!!!My name is B or BG89....On this Channel,I will be doing videos like.....☑️ Gameplay ☑️ Funny Video☑️ Live And more others!!!!!I register w...The rear sht has a large aperture for fast target acquisition. It excels at close ranges (inside 75 yards) and in low-lht conditions. It mounts on top of the M89’s bolt. Bill