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Posted: 8/24/2015 11:54:09 PM EST
So lately I've been trying to shoot my A4 clone on the bench with an RCO A4. What I've noticed now is that my bench zero is vertically strung about 2 inches higher from my offhand zero at 25 yrds. Anyone ever experienced this before? At first I thought it was my cheek weld but using my NM A4 with the same scope I don't see a change in POI.
Link Posted: 8/25/2015 1:36:14 AM EST
My A4 clone did this if I used a bi-pod with it - like 3-4" high at 100 yards.  I have since switched to a FF DD Lite rail III and the problem went away.
Link Posted: 8/25/2015 5:10:53 AM EST
What part of the chevron did you use to zero at 25m (82ft), and which part at 100m (328ft)?
Link Posted: 8/25/2015 6:29:53 AM EST
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What part of the chevron did you use to zero at 25m (82ft), and which part at 100m (328ft)?
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I originally zeroed at 100 m with the tip of the chevron. It was then that I noticed my shots were about a foot off when I was shooting offhand. I had to readjust my zero everytime upon sighting it in from the bench.
Link Posted: 8/25/2015 7:25:59 PM EST
Link Posted: 8/27/2015 8:02:40 AM EST
I learned that on non FF ar's you have to grab and hold the ar pretty much the same way every time you shoot it or you will go nuts.
Shooting from a bench if your support hand is on the handguard they will be higher POI  then a magazine well hold, so i try to always hold with my left hand the mag well hold, off the bench or off-hand.
This is very easy to test for, shoot a group using each hold, a dozen shots will show up, FF dont have this isuue.
Link Posted: 8/27/2015 7:12:21 PM EST
HBAR helps with this.
Link Posted: 8/27/2015 9:11:16 PM EST
Link Posted: 8/27/2015 10:13:40 PM EST
One of my ar's is a 20" hbar DD barrel in a areo upper reciver, the thing shoots super tight groups at a 100yds, BUT you need to keep your left hand off the front of the handguard, unless i shoot all my groups like that , then i am ok, but move my hand from front to back on mag well and poi will drop every time, 3 to 4 inches
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HBAR helps with this.
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Link Posted: 9/2/2015 10:15:25 PM EST
Shoot a Colt HBAR, benched it grouped in one spot, slung up, another.  When slung, had a lot of vertical grouping.  Put in FF tube, all was well.  You CAN pull an AR barrel out of "alignment" with a sling.  Different sling tension or pressure on the barrel will change grouping on an AR.
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