AR15.Com Archives
 Best Way To Zero A Newly Built Rifle With Magpul MBUS Sights
dbnorton  [Team Member]
5/10/2011 9:47:46 PM EST
Just as the title what is the best way to zero a newly built AR15 with Magpul MBUS sights?
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eric10mm  [Team Member]
5/10/2011 9:55:00 PM EST
Same as with any other rifle. Start at a real short distance and/or use a bore-sighter of some sort.
Kihn  [Member]
5/10/2011 11:54:14 PM EST
Approximate zero at 25ft, then 50 yds, then see where the bullets were placing at 100 yds is how i used to do it for irons. If you've got a red dot, center the gun to that for whatever BZO you use (e.g. Santose method to 50 yds) then adjust your BUIS to match the dot placement in the RDS while looking through both. You can start closer in to see where you are grouping and adjust to center (horizontal adjustment) to be closer to the zero before moving the target out for your BZO and your final adjustments (horizontal and vert).

Then verify using just the BUIS for bullet placement at your zero distance.

You are going to want to know where the bullets are placing at 100 yds (as well as 200 yds and 300 yds or more if you have the means).
David14  [Team Member]
5/11/2011 5:46:43 AM EST
http://ar15zeroing.com/
Scroll down to Improved Battlesight Zero.
scottrh2  [Team Member]
5/11/2011 6:04:39 AM EST
50m target. Shoot till POA and POI are equal. You will then have a 50-200m zero.
dbnorton  [Team Member]
5/11/2011 6:45:06 AM EST
Thanks everyone for the response I now have a starting point.
tatsngats  [Member]
5/11/2011 7:23:35 AM EST
To get on paper I seperate the upper/lower and remove the BCG then set the rifle on a solid platform and look down the barrel at an object/target about 25 meters away. While keeping it there I then look through my irons and make any adjustments necessary to center the sights on the same object/target. This will get you on paper. Then use the above methods to fine tune it at the range. This is the same method I use for scopes and it works great.
SA80Dan  [Team Member]
5/11/2011 10:07:52 AM EST
I always first do an eyeball boresight; usually at an object 100 yards away. Make sure you secure your separated upper to a small bench or something, then move the whole bench around until you can see whatever object you have picked right in the center of view when looking right through the barrel. Then without moving the rifle at all adjust your sights to reflect the picture you are seeing through the barrel.

I've gotten pretty handy at this over the years and can usually get the first shot within just a few inches at 100 yards. Fancy laser boresighters are not required on rifles where you can see all the way through the barrel.
BigHat  [Member]
5/11/2011 11:06:49 AM EST
Sorry,
Missed a similar process listed above.
Jmacken37  [Team Member]
5/11/2011 3:27:45 PM EST
Originally Posted By tatsngats:
To get on paper I seperate the upper/lower and remove the BCG then set the rifle on a solid platform and look down the barrel at an object/target about 25 meters away. While keeping it there I then look through my irons and make any adjustments necessary to center the sights on the same object/target. This will get you on paper. Then use the above methods to fine tune it at the range. This is the same method I use for scopes and it works great.


This is the method I use, too. Works great.

Jake

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