planning out an "ohsht here it comes!!" ar15. there are two acogs im interested in the ta31f with green chevron and the m150rco with green as well. difference is 200$ in price more for the 150. i cant tell the real difference between the two and decide if 200$ more for the 150 is worth it. i cant find any contrast and compair features to make an educated decision. oh, its going on either a bcm 16" midlength a4 lightweight or an rra in a similar config. difference between em is the 1/9 twist rra or a bit better gun but with 1/7 from bcm.