Iron zeroing question

[problemchild]

I have a pair of Troys and zero'd them yesterday at the range. To get 100yd zero I had to screw the front post all the way till it bottomed out. The rear is 80% to the right in the slot.

What is off? The rail or the barrel? Do they make shorter from posts for "issues" like this?

(Larue upper, bcm barrel JP rail)

[m16]

Sounds like the handguard is tweaked up and to the left.

On longer handguards, a problem like this is much more noticeable.

Did you use a carry handle or something similar to bridge the handguard and the upper before locking it down?

[barrage]

You might want to consider finding a way to mount your front sight to the gas block instead of the hanguard. That's probably also why your rear needs to be tweaked all the way over to the right since the hanguard isn't going to be perfectly lined up with the barrel, especially if its free floating.

[-hanko]

You might want to consider finding a way to mount your front sight to the gas block instead of the hanguard. That's probably also why your rear needs to be tweaked all the way over to the right since the handguard isn't going to be perfectly lined up with the barrel, especially if its free floating.

^Thread.

The idea of a free-float handguard is to the handguard from the barrel...Front sight needs to be attached tightly and directly to the barrel...That's where the bullet exits.

Since the gas block should be tight as hell on the barrel, that's where the front sight needs to go.

Not sure why anyone would mount the sight to the handguard.

-hanko

[SloChicken]

^Thread.

The idea of a free-float handguard is to the handguard from the barrel...Front sight needs to be attached tightly and directly to the barrel...That's where the bullet exits.

Since the gas block should be tight as hell on the barrel, that's where the front sight needs to go.

Not sure why anyone would mount the sight to the handguard.

-hanko

Um, okay ...

a properly mounted free-float handguard has just as much opportunity to align a forward sight, and stay consistent with the rear sight as a gas block mounted sight does.

both the barrel and the handguard are mounted to the upper - please explain your logic on how the gas block is better?

Seemingly a longer sight radius offered by a lo-pro gas block and a long handguard would be superior to a mid or carbine gas block mounted sight - rifle length may come close, and dissipator types are equal to superior to the handguard mounts as far as sight radius goes.

Further on this point. Non free-float handguards have the opportunity to flex the barrel and throw off POA/POI as a result of the shooter pushing or pulling on the barrel via a sling under pressure or other variables. Free float hand guards eliminate much of this problem.

YMMV but that is convention these days.

[NiteQwill]

Same thing happened to me on a few of my AR's (DD, Troy, etc. rails). I say, if your grouping is fine and you're not needing to make adjustments for shooting long range, then why mess with it?

Now, my service rifle has my sights perfectly aligned, center-for-center. That is the only rifle I am picky about.

[m16]

Maybe he doesn't have a railed gas block?

All of my uppers have free floating handguards and the gas block is completely covered so where else can you possibly put your sight?

[tal3nt]

My front sight on my centurion c4 handguard has never shifted one bit. I can shoot nice tight groups with it, plus there is nowhere else to mount the front sight.

[barrage]

Maybe he doesn't have a railed gas block?

All of my uppers have free floating handguards and the gas block is completely covered so where else can you possibly put your sight?

I keep forgetting this is Calguns. Sorry guys, don't mind my advice. If you listen to me, it might make your rifle function better, but it won't look as cool and we can't have that.

[m16]

I keep forgetting this is Calguns. Sorry guys, don't mind my advice. If you listen to me, it might make your rifle function better, but it won't look as cool and we can't have that.

Ok Mr. Expert.

Please explain how you will "find a way" to mount a front sight to a low-profile gas block.

I prefer longer handguards because 7" is too cramped for my hands.

If you can't grasp that concept then I don't know what to tell you.

[Falstaff]

Um, okay ...

a properly mounted free-float handguard has just as much opportunity to align a forward sight, and stay consistent with the rear sight as a gas block mounted sight does.

both the barrel and the handguard are mounted to the upper - please explain your logic on how the gas block is better?

Seemingly a longer sight radius offered by a lo-pro gas block and a long handguard would be superior to a mid or carbine gas block mounted sight - rifle length may come close, and dissipator types are equal to superior to the handguard mounts as far as sight radius goes.

Further on this point. Non free-float handguards have the opportunity to flex the barrel and throw off POA/POI as a result of the shooter pushing or pulling on the barrel via a sling under pressure or other variables. Free float hand guards eliminate much of this problem.

YMMV but that is convention these days.

You're wrong, mounting the front sight to the handguard is never optimal, it is done strictly as a convienient auxiliary for weapons systems relying primarily on optics. Mounting the front sight to the barrel will always be more consistent and less prone to loss prone to move. As far as the free floating the barrel is concerned you're correct, it does help by allowing the barrel to return to the same position after each shot, but it is still better to mount the sight to the barrel.

[barrage]

Ok Mr. Expert.

Please explain how you will "find a way" to mount a front sight to a low-profile gas block.

I prefer longer handguards because 7" is too cramped for my hands.

If you can't grasp that concept then I don't know what to tell you.

It'd just be a waste of my time explaining this to people with attitudes like yours. You're not going to listen anyway since you guys know all the answers already. That's why you're having trouble with your sights and can't figure out why.

Awesome looking rifle though! Thumbs up!

[m16]

I'm not the one having trouble with my sights.

Great reading comprehension.

[SuperSet]

Troy makes two types of railed front sights. One to go on a gas block and the other to go on a hand guard.

[Speedpower]

So where do I install the front sight on this one?