AR Sponsor
Posted: 3/12/2007 1:04:42 PM EDT
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I'll be the first to get this out of the way - I'm about to ask some dumb newb questions that I should already know the answers to. That being said... Second time ever at the range this last weekend with my new Bushy 20" A3. Shot another 200 rounds - no optics yet. Really trying to master the irons first, learn the rifle, then probably scope. Anyway, I'm shooting 2" high at 50 yards - about 4" high at 100 yards. I know with a scope, if you are shooting high, you rotate the elevation up - follow the path of the bullet. However, on my front post site, there is an arrow pointing to the left that says "up". I assumed that I would rotate the post clockwise, to raise the front site, therefore following the path of the bullet, and bringing my groups down. I read in the manual last night, actually, that in order to lower my groups, I should rotate the post counterclockwise. I did this, and I could swear the post was going up; which is a good thing. So, what's the deal? If I need to lower my groups, why would it have "Up" marked with the arrow going left (clockwise). Is this marking saying that to move my groups up I should rotate that direction? Best I can figure. It just seems total opposite on a scope. If I'm shooting high with a scope, I turn the elevation turret towards the "Up" mark. Am I completely confused and dumb here? |
| First, get yourself a keychain front sight tool, it's much easier than using a bullet. Rotating the post clockwise makes the bullet go up. Counter clockwise makes it go down. If you are zeroing in at 100 yards, you may have a problem with the front sight post starting to come out of the well since you have a detachable carry handle. When they went to the flat top design the only manufacturer to compensate for the issue was Colt. |
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To help you visulalize what is going on, draw a large shallow angle right-triangle on a piece of paper. Now, a short distance away from the shallow angle draw another vertical line that is about 2 times as long as needed to make a triangle (extends above the long side). Next, draw a line from the shallow angle point across the top of the new line to the end of the paper. Extend the vertical line at the end of the paper to intersect the line you just drew. Imagine that if your bullets were originally hitting too high (like at the top of that line you extended) and you needed to adust you sights so that they were lined up with the point of impact, which way do you need the front blade to move (the short line close to the corner). You will see from your drawing that if you raised the front sight, then your line of sight would now match where your bullet holes were hitting. If you were to lower the front sight, then that would make the point of impact even further away from where your sights are aimed. Hope this helps you visualize what happens with iron sights. BTW you can do the same thing to visualize the rear sight movement if you extend the legs of the triangle past the origin to make another small triangle. Think of a long "x" shape. Dave. |
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Rule of Thumb: Front sight Opposites: Sight goes up, bullet goes down Sight goes down, bullet goes up Sight goes left, bullet goes right Sight goes right, bullet goes left Rear sight Same direction: Sight goes down, bullet goes down Sight goes up, bullet goes up Sight goes left, bullet goes left Sight goes right, bullet goes right Obviously, on the AR and other systems, both sights do not adjust windage and elevation on both front and rear sights. Just trying to give you a general guideline, for weapon systems in general. |
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