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Posted: 11/30/2016 5:50:39 PM EDT
[#1]
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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Posted: 11/30/2016 6:21:52 PM EDT
[#2]
Really
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Posted: 11/30/2016 6:51:20 PM EDT
[#3]
Anytime you're changing major components you need to rezero.
I'd rezero even just changing the muzzle devise. A barrel? Oh HELL yeah. |
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Posted: 11/30/2016 6:55:02 PM EDT
[#4]
Quote HistoryQuoted:
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. 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. |
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Posted: 11/30/2016 7:00:34 PM EDT
[#5]
Of course
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Posted: 11/30/2016 7:01:12 PM EDT
[#6]
Quote HistoryQuoted:
Of course |
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Posted: 11/30/2016 7:24:23 PM EDT
[#7]
Yes!
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Posted: 11/30/2016 8:16:43 PM EDT
[#8]
Quote HistoryQuoted:
Really I'll second this... OP you can't possibly be serious... 
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Posted: 11/30/2016 10:32:45 PM EDT
[#9]
As above...This
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Posted: 12/1/2016 1:37:29 AM EDT
[#10]
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. |
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Posted: 12/1/2016 2:52:55 PM EDT
[#11]
Quoted:
Well, I just swapped barrels from a Stealth 18" to 16". Would I need to rezero? If you bought a new rifle would you need to zero it? 
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Posted: 12/1/2016 4:34:09 PM EDT
[#12]
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. |
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Posted: 12/1/2016 4:48:01 PM EDT
[#13]
Gives you an excuse to go shooting. Don't see the problem.
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Posted: 12/1/2016 5:01:46 PM EDT
[#14]
Quoted:
Well, I just swapped barrels from a Stealth 18" to 16". Would I need to rezero? Surprised you had to ask with your join date. |
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Posted: 12/14/2016 1:11:19 AM EDT
[#15]
Even removing a barrel, and reinstalling it will require rezeroing the sights.
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Posted: 12/15/2016 1:40:13 AM EDT
[#16]
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. |
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Posted: 12/15/2016 7:29:52 AM EDT
[#17]
Does this belong in the tech forum?
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Posted: 12/15/2016 10:27:10 AM EDT
[#18]
I check my zero every outing, even with no changes. Definitely going to need a re-zero in your situation
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Posted: 12/15/2016 10:50:59 AM EDT
[#19]
Quote HistoryQuoted:
I check my zero every outing, even with no changes. Definitely going to need a re-zero in your situation Same. |
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Posted: 12/15/2016 11:11:17 PM EDT
[#20]
I swapped a 10-22 barrel with another factory 10-22 barrel and it was 10" low afterwards, you need to rezero.
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Posted: 12/16/2016 1:29:46 PM EDT
[#21]
Quote HistoryQuoted:
Does this belong in the tech forum? <img src=http://www.ar15.com/images/smilies/smiley_thinking.gif border=0 align=middle> Well technically, this post is retarded, so yes I guess so? |
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Posted: 12/17/2016 1:35:39 AM EDT
[#22]
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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