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View Full Version : any easy way to tell if you have a canted front sight base


kermit315
05-31-2009, 9:41 PM
Hey guys,

is there a quick and easy way to tell if my FSB is canted? I have a generic rear iron on my AR, and it seems to be cranked way to the right to get it to shoot straight. Now, I can hit what I am aiming at, but if I need to adjust for windage in that direction anymore, I wont have very far to mess with. Somebody a while back suggested that it might be a canted FSB, but I got busy and, truthfully, forgot about it.

Thanks guys,

jamie

Jicko
05-31-2009, 9:46 PM
Ask randall (ar15barrels), he got some tools for that... (and a picture too)

kermit315
05-31-2009, 9:49 PM
cool. I just mostly want to know at this point. I have an aimpoint on it, but if the FSB is canted, I will just take off the iron backup until I get it fixed. besides, I only have 2 weeks left here, and have a ton of stuff to get finished up before the move, so I dont know that I would be able to even get to Randall.

Ruiner
05-31-2009, 9:56 PM
If you are hitting what youre are aiming at, then I wouldnt bother removing the BUIS completely. Just keep it on there until you get it fixed. :)

kermit315
05-31-2009, 10:01 PM
yeah, I know what you are saying. I guess we will see. Like I said, I mostly want to just know for now if its canted or not.

I am gonna PM Randall, and see what he has to say, but dont let the preclude anybody else from posting in this thread. Something posted now may save somebody a post later (assuming they use the search first....lol)

Vtec44
05-31-2009, 10:24 PM
here's a picture for an AK, since it's more common from what I've heard. My AK's and AR's are all straight. I'd put one of those bubble leveler on the rear sight and one on the front sight, pretty much then you can tell if they're aligned.


The front sight base is not straight up and aligned with the rear sight.

http://img136.imageshack.us/img136/5216/pix831623125pl9.jpg

Here's a better illustration...

http://www.gunsnet.net/Linx310/cant.htm

http://www.gunsnet.net/Linx310/images/cant/cant1.jpg

domokun
05-31-2009, 10:44 PM
Hey guys,

is there a quick and easy way to tell if my FSB is canted? I have a generic rear iron on my AR, and it seems to be cranked way to the right to get it to shoot straight. Now, I can hit what I am aiming at, but if I need to adjust for windage in that direction anymore, I wont have very far to mess with. Somebody a while back suggested that it might be a canted FSB, but I got busy and, truthfully, forgot about it.

Thanks guys,

jamie

What kind of rear sights are you using? I'm having the same problem and I've had my front sight block already checked and corrected for any canted front sight issues by m24armorer and it's still shooting way to the left. At this point I've deduced it down to being an out of specification detachable carry handle sight.

kermit315
06-01-2009, 7:31 AM
I dont know, some cheap gun show rear iron, same setup as a carry handle, but no handle part. d

I will take a picture of it after work and put it up here for critiquing.

kermit315
07-28-2009, 3:47 PM
from what I learned here, I dont think it is. I will see if I still have the PM from Randall and if so I will forward it to you.

missiontrails
07-28-2009, 4:03 PM
Take off the rear sight. If it is canted enough to matter, you will see it. Use the rails on top of the upper receiver as your reference when you look down the front sight.

ar15barrels
07-29-2009, 8:59 AM
http://www.ar15barrels.com/tech/fsb-alignment.jpg

bombadillo
07-29-2009, 10:08 AM
Wow, randall what the heck is that? Obviously its for aligning the front and rear to keep true to the barrel somehow but 'splain a little more about that thing.

fonionrings
07-29-2009, 10:46 AM
Is that simply a rod with a diameter close enough to fit snugly in the channel of the carry handle and long enough to reach the FSP?

Excellent.

http://www.ar15barrels.com/tech/fsb-alignment.jpg

ar15barrels
07-30-2009, 2:45 PM
Wow, randall what the heck is that? Obviously its for aligning the front and rear to keep true to the barrel somehow but 'splain a little more about that thing.

This:

Is that simply a rod with a diameter close enough to fit snugly in the channel of the carry handle and long enough to reach the FSP?

It's a 0.500" diameter hardened and ground rod that I turned a point on the end.

You can buy the same tool commercially produced, but I had the ground rod in my shop so I made my own.
I have them in carbine, mid and rifle lengths.

popeye4
07-30-2009, 5:39 PM
This:



It's a 0.500" diameter hardened and ground rod that I turned a point on the end.

You can buy the same tool commercially produced, but I had the ground rod in my shop so I made my own.
I have them in carbine, mid and rifle lengths.

It is genius in its simplicity.