Has anyone ever tried zeroing their A1'a using mechanical zero or boresight zero method? Are they reliable? The methods are described as follows: 1. Mechannical zero - adjust front sight until base of post is flush with the top part of the post receptacle, then turn 11 clicks in direction of up, for the drum, turn all the way until the eyepice is to the leftmost, then 17clicks to the right. 2. Boresight Zero - remove upper and BCG from rifle, then align bore with a target at 25 yards. Then look at sights to see if sight picture is the same. If not adjust sights accordingly until sight as viewed from barrel is now the same as sight as viewed from the iron sights, Happy easter to all! Wanna kill these ads? We can help!