Bushy A1 Front Post Too Tall

[cjlandry]

Trying to zero my rifle today. Post screwed all the way down. Shooting 2.5" too low at 25 meters.

Should I try to find a shorter post or just file this one down a smidge?

[Steve in PA]

Adjust the screw the other way. Raising the sight lowers the POI, lowering the sight raises the POI.

[cjlandry]

Originally posted by Steve in PA
Adjust the screw the other way. Raising the sight lowers the POI, lowering the sight raises the POI.

That's what I was getting at. I've lowered the sight all the way and the POI still needs to come up a bit.

I appreciate the input, but I know which way to move the front post to bring the muzzle up. It's not rocket surgery. ;)

Post screwed all the way down (lowered). POI still too low.

[Algaroth]

What kind of rear sight are you using? I'm assuming a carry handle, and you have it zeroed for 300 meters. If so...

I had to screw my front post up a good bit to zero mine in. Mine was shooting pretty high before I sighted it in. And that's with the rear sight properly zeroed for 300 meters.

But anyway, what kind of rear sight are you using?

[Steve in PA]

Sounds like you need to get a taller front sight post. Bushmaster sells them.

[ColoradoPacker]

:animlol: :rofl:

File it down.

[cjlandry]

Originally posted by Steve in PA
Sounds like you need to get a taller front sight post. Bushmaster sells them.

The front sight post needs to go down to bring the point of impact up. A taller front sight post would make this even more difficult.

Seriously, think about this. The top of the front post is centered in the aperture. Draw a straight line across these two points, then draw another straight line along the bore. Raise the front sight post, draw another line across that. Can you see that now your point of aim is higher in relation to the bore line, thus lowering the point of impact further?

Originally posted by Algaroth
What kind of rear sight are you using? I'm assuming a carry handle, and you have it zeroed for 300 meters. If so...

I had to screw my front post up a good bit to zero mine in. Mine was shooting pretty high before I sighted it in. And that's with the rear sight properly zeroed for 300 meters.

But anyway, what kind of rear sight are you using?


The rear sight is an A1 with no elevation adjustment, other than the two flip up apertures.

Anyway, the problem is solved. No filing or shorter front sight required.

I removed the post and found a slight burr in the threads which was preventing me from lowering it enough with the tip of a bullet. A punch and a tiny crescent wrench got me past that and I was able to lower the front post enough to take care of it.

Thanks for the suggestions.

[Steve in PA]

Yeah, after I posted that I knew it was wrong. Shorter is what you need....not longer.

[halfmoonclip]

Originally posted by Steve in PA
Yeah, after I posted that I knew it was wrong. Shorter is what you need....not longer.

Easy enough to get it wrong, since what you do to the front sight is exactly the opposite of what you do with the rear.

Luckily, the FSB and the rear sight wheel are marked as to how bullet impact will shift; otherwise, I'd get it screwed up. :supergrin:

Moon

[Algaroth]

Glad to hear you got it fixed. :thumbsup:

[cjlandry]

Originally posted by halfmoonclip
Easy enough to get it wrong, since what you do to the front sight is exactly the opposite of what you do with the rear.

Luckily, the FSB and the rear sight wheel are marked as to how bullet impact will shift; otherwise, I'd get it screwed up. :supergrin:

Moon

I tend to think opposite, as I've used "Kentucky Windage" so many times. I think of where I'm going to aim.

To overcome that obstacle, I have to imagine the two lines. One along the bore, the other along the line of sight. That always tells me which sight to move which way.

In the case of my A1, only the front sight is a factor in elevation, so it's even simpler.

[halfmoonclip]

cj, I can deal with holding under or over, but allowing for elevation AND windage makes my head hurt.
I have a fixed sight revo that is a little off, but a couple shots remind me of about where I have to hold.
We have this mantra down at the gun club, "It's not a target gun, it doesn't matter." All that said, we promptly try to make everything a target gun.
Moon