I have a Colt 6920 that came with the detachable carry handle. Can I use a Matech BUIS instead of the Carry handle Iron sights on it? It has the F marked FSB. I like the Matech BUIS because I am Running a ACOG on this upper and I want the Matech as my Back up Iron sight if the Acog fails ( I doubt it will). Is it a go? will it zero? If so what elevation do I use? The 300meter ? The upper has a 16in barrel.
Yes…
Zero o at 25 yards with the elevation set to 200.