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Posted: 11/30/2016 4:12:22 PM EST
Well, I just swapped barrels from a Stealth 18" to 16". Would I need to rezero?
Link Posted: 11/30/2016 4:50:39 PM EST
[Last Edit: 12/1/2016 10:34:38 AM EST by cttb]
Yes.

I would be shocked if you're within 2" at 100 yards of your old zero, and would not be surprised if you're 10" off. The loss in velocity will drop you at least .5" at 100 yards. Re-assembling the upper will introduce anything from a very little to a whole lot of variation.
Link Posted: 11/30/2016 5:21:52 PM EST
Really
Link Posted: 11/30/2016 5:51:20 PM EST
Anytime you're changing major components you need to rezero.

I'd rezero even just changing the muzzle devise.

A barrel? Oh HELL yeah.
Link Posted: 11/30/2016 5:55:02 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By cttb:
Yes.

I would be shocked if you're within 2" at 100 yards of your old zero, and would not be surprised if you're 10" off. The loss in velocity will drop you at least .5" at 100 yards. Re-assembling the upper will introduce anything from a very little to a whole lot of variation.
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I guess I should've clarified haha. Knowing my drop comps and holds, I just adjusted my scope to accommodate for the drop.

I'll get out today and see. Gives me a reason to hit up the range.
Link Posted: 11/30/2016 6:00:34 PM EST
Of course
Link Posted: 11/30/2016 6:01:12 PM EST
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Originally Posted By Click2Boom:
Of course
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Link Posted: 11/30/2016 6:24:23 PM EST
Yes!
Link Posted: 11/30/2016 7:16:43 PM EST
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Originally Posted By PhulesAu:
Really
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I'll second this... OP you can't possibly be serious...
Link Posted: 11/30/2016 9:32:45 PM EST
As above...This
Link Posted: 12/1/2016 12:37:29 AM EST
Your need to rezero in this case has very little to do with 18" to 16" barrel, and everything to do with installing a new barrel.

While there is a little velocity change for 18" to 16", it would hardly be enough to matter. But even if you replaced the 18"
barrel with another identical 18" barrel, you need to rezero. Just taking off the 18" and reinstalling it will change zero.

There is no way that a new barrel will seat in the upper receiver exactly the same way as the previous barrel. A very slight
change in the way the index pin goes into the slot of the upper receiver, the way the front sight base is mounted, and even
very slight bending of the upper when torquing up the barrel nut will all affect it.

This is also why you can't "memorize" or "write down" your sight click numbers and apply them to another rifle "to get your
personal sight in." Sorry, but every rifle is different.
Link Posted: 12/1/2016 1:52:55 PM EST
Originally Posted By nj0ywatch1np0rn:
Well, I just swapped barrels from a Stealth 18" to 16". Would I need to rezero?
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If you bought a new rifle would you need to zero it?
Link Posted: 12/1/2016 3:34:09 PM EST
Err....

Really?

Removing a barrel and then swapping in a new one would most certainly require a re-zero unless you're tremendously lucky. And...I mean...it's 20 rounds or less to zero. Just do it and be done with it until the next time you play a LEGO swap.
Link Posted: 12/1/2016 3:48:01 PM EST
Gives you an excuse to go shooting. Don't see the problem.
Link Posted: 12/1/2016 4:01:46 PM EST
Originally Posted By nj0ywatch1np0rn:
Well, I just swapped barrels from a Stealth 18" to 16". Would I need to rezero?
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Surprised you had to ask with your join date.
Link Posted: 12/14/2016 12:11:19 AM EST
Even removing a barrel, and reinstalling it will require rezeroing the sights.
Link Posted: 12/15/2016 12:40:13 AM EST
Did OP stop watching porn long enough to figure out an answer to his question?

This is what happens when you spend 99% of your arfcom life in GD.
Link Posted: 12/15/2016 6:29:52 AM EST
Does this belong in the tech forum?
Link Posted: 12/15/2016 9:27:10 AM EST
I check my zero every outing, even with no changes. Definitely going to need a re-zero in your situation
Link Posted: 12/15/2016 9:50:59 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By DefenderAO:
I check my zero every outing, even with no changes. Definitely going to need a re-zero in your situation
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Same.
Link Posted: 12/15/2016 10:11:17 PM EST
I swapped a 10-22 barrel with another factory 10-22 barrel and it was 10" low afterwards, you need to rezero.
Link Posted: 12/16/2016 12:29:46 PM EST
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Originally Posted By JohnDough:
Does this belong in the tech forum? <img src=http://www.ar15.com/images/smilies/smiley_thinking.gif border=0 align=middle>
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Well technically, this post is retarded, so yes I guess so?
Link Posted: 12/17/2016 12:35:39 AM EST
[Last Edit: 12/17/2016 12:36:49 AM EST by MS556]
Even if you got lucky and seated the barrel index pin exactly the same on two barrels of the same length, barrel harmonics will differ. That is the vibration of the barrel as the bullet traverses its distance. Where the muzzle is in that vibration cycle when the bullet exits has a significant effect on point of impact. Change barrel length and profile and the zero is likely to be way off.
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