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 So if I move a scope in a mount up one picatinny section, will it change the zero significantly?
cableguy221  [Team Member]
3/1/2013 6:37:13 PM EDT
I have a scope in a larue SPR 1.5 mount. I moved it up one notch. If I'm going to shoot a competition(with most shots being between 0-200M) with it, do I really need to rezero it? I can't imagine the zero would change much.
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Crowcreek  [Member]
3/1/2013 6:47:26 PM EDT
I'll say theoretically that the only effect it will have is putting the weight a little more forward on the barrel.

This will slow the recoil arc of the rifle and make the point of impact a little lower.

If it has much effect at all, I'll feed your cat for a day.
aardvark_ratnick  [Team Member]
3/1/2013 6:49:35 PM EDT
yes
_Matt_  [Team Member]
3/1/2013 6:50:04 PM EDT
Originally Posted By Crowcreek:
I'll say theoretically that the only effect it will have is putting the weight a little more forward on the barrel.

This will slow the recoil arc of the rifle and make the point of impact a little lower.

If it has much effect at all, I'll feed your cat for a day.


The bullet is long gone from the barrel before any recoil would affect the trajectory


To answer the question, it should be minute of man, but may be off, so you should shoot to verify
ar2de  [Member]
3/1/2013 6:50:40 PM EDT
It shouldn't affect the zero, but rifles (esp light weight ones) are sensitive to changes. A couple rounds down range will tell for sure.
Flats  [Member]
3/1/2013 6:52:57 PM EDT
Theoretically, no. The geometry hasn't changed. If I were shooting a competition I would check, though.
TXJoe  [Member]
3/1/2013 6:59:04 PM EDT
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?
cableguy221  [Team Member]
3/1/2013 7:02:04 PM EDT
Originally Posted By TXJoe:
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?

It doesn't change if you mount it to the same bracket it was one before. It moved up a bit further. It will change, but not significantly I would think.
ugagrad06  [Team Member]
3/1/2013 7:02:55 PM EDT
Originally Posted By TXJoe:
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?


You must not know larue or their spr mount. Zero shift guaranteed. Many many many have tested it.

Posted Via AR15.Com Mobile
Mosspointers  [Member]
3/1/2013 7:04:15 PM EDT
Geometrically, yes but not enough to matter at those distances.
EFB16ACRX  [Life Member]
3/1/2013 7:05:49 PM EDT
Well, thats going to depend on who machined the upper you have. Might not move at all, might be 2 feet off ( I would hope not ).
chupacabras  [Team Member]
3/1/2013 7:06:12 PM EDT
It moved.

TXJoe  [Member]
3/1/2013 7:06:56 PM EDT
Originally Posted By ugagrad06:
Originally Posted By TXJoe:
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?


You must not know larue or their spr mount. Zero shift guaranteed. Many many many have tested it.

Posted Via AR15.Com Mobile


Very interesting, I did not need to know this as I am almost sure I will not be able to afford one.

BrdChris  [Member]
3/1/2013 7:09:57 PM EDT
I had a laser alignment class at work today. Apparently your screwed.
iluvguns  [Team Member]
3/1/2013 7:13:08 PM EDT
if your shooting a competition then i would go ahead and check your zero. That way your not wondering if your misses were from not being zeroed.

RECONSIX  [Member]
3/1/2013 7:15:27 PM EDT
Originally Posted By TXJoe:
Originally Posted By ugagrad06:
Originally Posted By TXJoe:
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?


You must not know larue or their spr mount. Zero shift guaranteed. Many many many have tested it.

Posted Via AR15.Com Mobile


Very interesting, I did not need to know this as I am almost sure I will not be able to afford one.



They're only $210 or you could get a non-QD mount for $50 less.

Darkstar117  [Team Member]
3/1/2013 7:19:05 PM EDT
Originally Posted By TXJoe:
Originally Posted By ugagrad06:
Originally Posted By TXJoe:
So you basically took the scope off the rifle and re-mounted it and you think the zero won't change?


You must not know larue or their spr mount. Zero shift guaranteed. Many many many have tested it.

Posted Via AR15.Com Mobile


Very interesting, I did not need to know this as I am almost sure I will not be able to afford one.



http://www.laruetactical.com/larue-tactical-spr-s-mount-lt-158
Keith_J  [Life Member]
3/1/2013 7:23:02 PM EDT

Originally Posted By _Matt_:
Originally Posted By Crowcreek:
I'll say theoretically that the only effect it will have is putting the weight a little more forward on the barrel.

This will slow the recoil arc of the rifle and make the point of impact a little lower.

If it has much effect at all, I'll feed your cat for a day.


The bullet is long gone from the barrel before any recoil would affect the trajectory


To answer the question, it should be minute of man, but may be off, so you should shoot to verify

You think. But there is a reason the Ransom Rest for pistols recoils. But the AR15 platform is a straight recoil design. You still can get a point of impact change with different positions.
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