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10/24/2016 3:25:00 PM EDT
Anyone else have a rifle that really doesn't like swapping can for no can?

Of all my rifles I have one that shifts more than about 1.5", and it shifts nearly 12 times that.  Any idea what would cause this in one rifle?

Setup is a 16" 556 tOBR, SF break, SOCOM mini, ACOG 4x32, LT105, shooting 855.

No strikes rubs or anything else to indicate the can is the issue.  Accuracy is fine with or without the can or I'd say I over torqued the break.  I'm lost.
10/24/2016 5:48:03 PM EDT
[#1]
Threads not being concentric to the bore maybe?

Or out of spec brake, causing it to mount a little off.
10/24/2016 7:16:58 PM EDT
[#2]
Send entire setup to me and ample ammo for testing purposes. I'll contact you when testing/evaluation is complete and submit my findings.
10/24/2016 7:36:04 PM EDT
[#3]
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Quoted:
Threads not being concentric to the bore maybe?

Or out of spec brake, causing it to mount a little off.
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If it was any other barrel maker I'd wonder about that. Is ther any sort of field expedient way to check?
10/24/2016 7:37:00 PM EDT
[#4]
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Quoted:
Send entire setup to me and ample ammo for testing purposes. I'll contact you when testing/evaluation is complete and submit my findings.
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This sounds like a good idea but I'm not willing to seperate myself from the rifle. You could come down
10/24/2016 7:46:19 PM EDT
[#5]
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Quoted:


This sounds like a good idea but I'm not willing to seperate myself from the rifle. You could come down
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Quoted:
Quoted:
Send entire setup to me and ample ammo for testing purposes. I'll contact you when testing/evaluation is complete and submit my findings.


This sounds like a good idea but I'm not willing to seperate myself from the rifle. You could come down

Wish I could.
10/25/2016 12:22:10 AM EDT
[#6]
Clearly you must buy another barrel to trouble shoot the situation.
10/25/2016 6:32:34 AM EDT
[#7]
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Quoted:
Clearly you must buy another barrel to trouble shoot the situation.
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Hmmm, I have other barrels I could stick on there but what problem would that identify?
10/25/2016 6:55:52 AM EDT
[#8]
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Hmmm, I have other barrels I could stick on there but what problem would that identify?
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Quoted:
Quoted:
Clearly you must buy another barrel to trouble shoot the situation.


Hmmm, I have other barrels I could stick on there but what problem would that identify?


potential mechanical properties issue with the barrel, i.e. not at the strength it should be and is sagging from the weight of the can?

ETA: highly doubt that is the issue with a LaRue barrel, unless its one of the older LW or very early in house field grades?
10/25/2016 7:17:41 AM EDT
[#9]
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Quoted:


potential mechanical properties issue with the barrel, i.e. not at the strength it should be and is sagging from the weight of the can?

ETA: highly doubt that is the issue with a LaRue barrel, unless its one of the older LW or very early in house field grades?
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Quoted:
Quoted:
Quoted:
Clearly you must buy another barrel to trouble shoot the situation.


Hmmm, I have other barrels I could stick on there but what problem would that identify?


potential mechanical properties issue with the barrel, i.e. not at the strength it should be and is sagging from the weight of the can?

ETA: highly doubt that is the issue with a LaRue barrel, unless its one of the older LW or very early in house field grades?


No it's full LT, maybe I'll swap out and pop a few shots.
10/25/2016 7:27:13 AM EDT
[#10]
if i understand your first post right are you saying instead of the typical 1.5 inch shift with a can you are getting an 18 inch shift?
10/25/2016 7:30:02 AM EDT
[#11]
have you tried another ammo type/weight?
10/25/2016 7:36:26 AM EDT
[#12]
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if i understand your first post right are you saying instead of the typical 1.5 inch shift with a can you are getting an 18 inch shift?
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You understand correctly, shifts down and to the right.
10/25/2016 7:41:13 AM EDT
[#13]
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have you tried another ammo type/weight?
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Honestly I haven't shot it in suppressed in about two years but I remember the first time I shot it there was a significant correction. This weekend the boy and I were running drills so decided to save weight but he couldn't hit anything which is very much not like him and it took us a while to figure it out so we put the can back on and he was right back on target.

So all that to say I haven't tried other ammo yet...not that I have any other 556 ready to shoot anyway
10/25/2016 7:41:55 AM EDT
[#14]
Quote History
Quoted:


Hmmm, I have other barrels I could stick on there but what problem would that identify?
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Quoted:
Quoted:
Clearly you must buy another barrel to trouble shoot the situation.


Hmmm, I have other barrels I could stick on there but what problem would that identify?


You would have to move the Muzzle Device to the new barrel, but it would identify whether it's something with that barrel or with the MD/can.

ETA: to put it in perspective, while it's 18 inches at the target, that's only .3 degrees deflection somewhere at the gun... can got tweaked, mount got tweaked, fair amount of options.

10/25/2016 8:01:08 AM EDT
[#15]
Quote History
Quoted:


You would have to move the Muzzle Device to the new barrel, but it would identify whether it's something with that barrel or with the MD/can.

ETA: to put it in perspective, while it's 18 inches at the target, that's only .3 degrees deflection somewhere at the gun... can got tweaked, mount got tweaked, fair amount of options.

View Quote View All Quotes
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Quote History
Quoted:
Quoted:
Quoted:
Clearly you must buy another barrel to trouble shoot the situation.


Hmmm, I have other barrels I could stick on there but what problem would that identify?


You would have to move the Muzzle Device to the new barrel, but it would identify whether it's something with that barrel or with the MD/can.

ETA: to put it in perspective, while it's 18 inches at the target, that's only .3 degrees deflection somewhere at the gun... can got tweaked, mount got tweaked, fair amount of options.



18 inches is a miss on any target I'd shoot at

Other barrel has the break already so I'll give it a shot soon.
10/25/2016 10:35:31 AM EDT
[#16]
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Quoted:


18 inches is a miss on any target I'd shoot at

Other barrel has the break already so I'll give it a shot soon.
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Quote History
Quoted:
Quoted:
Quoted:
Quoted:
Clearly you must buy another barrel to trouble shoot the situation.


Hmmm, I have other barrels I could stick on there but what problem would that identify?


You would have to move the Muzzle Device to the new barrel, but it would identify whether it's something with that barrel or with the MD/can.

ETA: to put it in perspective, while it's 18 inches at the target, that's only .3 degrees deflection somewhere at the gun... can got tweaked, mount got tweaked, fair amount of options.



18 inches is a miss on any target I'd shoot at

Other barrel has the break already so I'll give it a shot soon.


I think what he is saying is even a sub 1 degree shift at the can/brake/threads can causes a huge shift at POI.
10/25/2016 11:19:00 AM EDT
[#17]
Any baffle strikes? I know that my mini was notorious for slight rubs and would throw off even at 100yds about 4-5in shifts.
10/25/2016 12:23:27 PM EDT
[#18]
S2S didnt geiselle make a rod that went in the bore for inspecting supresor concentricity?
10/25/2016 12:24:31 PM EDT
[#19]
My thought is that IF it was concentric you would not be seeing any LARGE shift, but you would see some shift just because
10/25/2016 12:25:22 PM EDT
[#20]
Third choice send mini to me for disposal( with all the right paperwork of course)
10/25/2016 12:32:54 PM EDT
[#21]
Quote History
Quoted:
S2S didnt geiselle make a rod that went in the bore for inspecting supresor concentricity?
View Quote


No idea. If it's not a 1911, CL3 or have a Larue stamp on it, it has probably been making it's way from my gungeon to EE
10/25/2016 12:33:16 PM EDT
[#22]
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Third choice send mini to me for disposal( with all the right paperwork of course)
View Quote


Paperwork, of course.

Go wait by your mail box.
10/25/2016 12:35:45 PM EDT
[#23]
Quote History
Quoted:


Paperwork, of course.

Go wait by your mail box.
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Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html
10/25/2016 12:36:55 PM EDT
[#24]
I will whore up your thread real good
10/25/2016 12:42:27 PM EDT
[#25]
Quote History
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Quoted:
Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html


$75 for 18" of brass rod? I'm in the wrong damn buisness
10/25/2016 12:46:28 PM EDT
[#26]
Quote History
Quoted:


$75 for 18" of brass rod? I'm in the wrong damn buisness
View Quote View All Quotes
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Quote History
Quoted:
Quoted:
Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html


$75 for 18" of brass rod? I'm in the wrong damn buisness


33.33%, repeating, of course, on the way to a new barrel, or you could just get the shaft.
10/25/2016 1:53:34 PM EDT
[#27]
Quote History
Quoted:


$75 for 18" of brass rod? I'm in the wrong damn buisness
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Quote History
Quoted:
Quoted:
Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html


$75 for 18" of brass rod? I'm in the wrong damn buisness



I dont think its brass but i do know that a precision ground rod takes a lot of time to make on a pricey surface grinder
10/25/2016 1:54:30 PM EDT
[#28]
would solve all your problems, or at least show you how to solve them
10/25/2016 2:05:21 PM EDT
[#29]
Quote History
Quoted:


$75 for 18" of brass rod? I'm in the wrong damn buisness
View Quote View All Quotes
View All Quotes
Quote History
Quoted:
Quoted:
Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html


$75 for 18" of brass rod? I'm in the wrong damn buisness


SUPERCONCENTRICITY!
10/25/2016 2:10:46 PM EDT
[#30]
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No idea. If it's not a 1911, CL3 or have a Larue stamp on it, it has probably been making it's way from my gungeon to EE
View Quote View All Quotes
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Quote History
Quoted:
Quoted:
S2S didnt geiselle make a rod that went in the bore for inspecting supresor concentricity?


No idea. If it's not a 1911, CL3 or have a Larue stamp on it, it has probably been making it's way from my gungeon to EE

Surefire carries them now, but they're made by G.
10/25/2016 2:11:49 PM EDT
[#31]
Quote History
Quoted:


$75 for 18" of brass rod? I'm in the wrong damn buisness
View Quote View All Quotes
View All Quotes
Quote History
Quoted:
Quoted:
Quoted:
Quoted:
Third choice send mini to me for disposal( with all the right paperwork of course)


Paperwork, of course.

Go wait by your mail box.


https://geissele.com/15-5-56mm-suppressor-alignment-rod.html


$75 for 18" of brass rod? I'm in the wrong damn buisness

Not brass. Precision ground tool steel.
10/25/2016 2:12:49 PM EDT
[#32]
I'm sure you know someone that has a barrel straightness gauge in your support unit armory.
10/25/2016 2:20:48 PM EDT
[#33]
I looked at mcmaster car and they have the rods but not in the correct size.

You get 3 feet of it though, and you could hand grind it down .007
10/25/2016 2:26:49 PM EDT
[#34]
the fact you've let this go for almost 2 years before starting any scientific experimentation perplexes even me


oh wait

Officer
10/25/2016 2:48:51 PM EDT
[#35]
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I'm sure you know someone that has a barrel straightness gauge in your support unit armory.
View Quote


10/25/2016 3:34:19 PM EDT
[#36]
Quote History
Quoted:
the fact you've let this go for almost 2 years before starting any scientific experimentation perplexes even me


oh wait

Officer
View Quote


Hey it shoots good with a can, it shoots good without a can...it just doesn't like to flip flop. I can't be blamed for liking to shoot with a can