Zeroing range for an Eotech mounted on an AR-15

Re: Zeroing range for an Eotech mounted on an AR-15

Old post

Here is a post from awhile back that has some good info and stats. You will just have to decide what works for you and the situations that you will be using the rifle for. Good luck and let us know what you end up with and why.

Take care,

Danel

Re: Zeroing range for an Eotech mounted on an AR-15

I go for 50yds knowing I'm good to 200+yds with that zero. Practically probably wouldn't use it much past 200yds anyway.

Re: Zeroing range for an Eotech mounted on an AR-15

50 for me too.

Re: Zeroing range for an Eotech mounted on an AR-15

300 meters is good. With it, bullet path will intersect at 25 meters, max ordinate will be at about 150 meters with bullet strike 7 to 10 inches high, and at 350 meters bullet will just be about 10 inches below point of aim. Even at 400 meters, bullet will only hit about 20 inches low. Shooting something like an E target, with a center of mass body hold, good hits are therefore possible with this zero out to 400 meters. General McCrystal once said,"gentlemen, there are two types of people on the battlefield, marksmen and targets". Having a BSZ for 300 meters makes sense in his context; and, with a BDC function the rifle becomes even more versatile.

Re: Zeroing range for an Eotech mounted on an AR-15

Here's a pretty good read so that you can set it up for what works best for you.
http://www.m4carbine.net/showthread.php?t=65679

Re: Zeroing range for an Eotech mounted on an AR-15

I read the article. One thing that's not accurate, the poster states that A2 and F a-frames being only .40 different are non issues. That's wrong, big time. Take an A4 or M4 with mil spec BDC and the short A2 a-frame and you'll find zeroing at 100 yards will require a bottomed out elevation wheel and at least 2 full revs up on the front post just to zero with 6 o'clock hold on an SR-1. Two revs up on the front sight, of course, causes it to be very loose in the front sight base. Bottom line, it is a huge problem but one not recognized as such from several AR assemblers. Either they don't understand, or don't care. Always seek an f marked a-frame for a flat top A4 or M4. The non-marked a-frame is for the fixed carry handle which has a sight about .40 lower than the detachable carry handle sight.

Re: Zeroing range for an Eotech mounted on an AR-15

KNS sells .4 higher pins too, so you aren't completely out of options if your fsb isn't a f-marked model.

Re: Zeroing range for an Eotech mounted on an AR-15

200Y.

Have it be precisely zeroed at 200Y, and 'trust' the 50Y vs. the other way around. Short distance zeroes are usually fudged, or conducted on huge targets for that distance resulting in an imprecise zero.

Trajectory wise you won't be much higher than your sight height from the muzzle to 200Y, and you will still be hitting a sil target at 300Y with a CM hold.

--Fargo007

Re: Zeroing range for an Eotech mounted on an AR-15

Buy a Matech BUIS. With it, a 200 or 300 meter BSZ is available from initial 25 meter zero; and, BDC is functional too. Make sure your flattop has an F marked front sight base that's for real and not just marked for show.

Re: Zeroing range for an Eotech mounted on an AR-15

I zero my Eotech and Aimpoints in at 50 yards and it just works especially when you close distance.

Re: Zeroing range for an Eotech mounted on an AR-15

I'd say have a soft zero at 50, then confirm at 200 and adj POA/POI at 200. I found that with my rifle it puts me an inch low at 25, 1/2 high at 50, 3 inches high at 100, and about ten inches low at 300. The only thing that I think may change at 300(well besides wind and all external factors) is the brightness on the reticle because I usually turn it down to make the dot "look" smaller.