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Posted: 5/15/2024 8:27:02 AM EDT
I ask because I have one of each and the 5.56 doesn’t want to shoot very accurately.  I put a bore scope in there and it looks like they ran a dull throat and neck reamer in it and gouged it all to hell??. Anyone else see this in theirs?
Link Posted: 5/15/2024 8:33:23 AM EDT
[Last Edit: ScoutH57] [#1]
I mean it just sounds like you got a friday at 4:45 pm barrel to me.   Particular chambering is less relevant than it just being a poorly finished product.


What guns?
Link Posted: 5/15/2024 8:56:42 AM EDT
[Last Edit: inkaybee] [#2]
Sig 553. I think it was hammer forged and nitrided and then reamed.

Gun is marked 2023 bbl is marked 2017
Link Posted: 5/16/2024 12:21:03 PM EDT
[Last Edit: hobo] [#3]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By inkaybee:
Sig 553. I think it was hammer forged and nitrided and then reamed.

Gun is marked 2023 bbl is marked 2017
View Quote



Thanks for posting this.  

Regardless of .223 or 5.56 markings ALL barrels are chambered to the EU pressure.
I wonder if the barrel is 1:10 twist ?  EDIT  Maybe not based on your other thread.


What type of accuracy issues are you experiencing?
I'm surprised this barrel passed test fire/QC.    
JDI import ? Did you buy the gun new?

Link Posted: 5/16/2024 12:24:58 PM EDT
[#4]
Yes new. 5 MOA
Link Posted: 5/16/2024 4:59:05 PM EDT
[#5]
What ammo did you try?

Did you try any other ammo?

What range/position were you shooting?

Have you ruled out optics/sights moving?
Link Posted: 5/16/2024 5:39:07 PM EDT
[#6]
Multiple ammo including mk262 federal msr and known quality hand loads off of front and rear bags concrete bench. I can shoot and have similar rifles to compare to.
Link Posted: 5/16/2024 6:58:46 PM EDT
[#7]
What optic, or are you using irons?

Always check the cheapest stuff first. Ammo, rings/bases, optics, etc.

If you think the chamber is gouged, what does the brass look like?
Link Posted: 5/17/2024 2:10:58 PM EDT
[#8]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By inkaybee:
Yes new. 5 MOA
View Quote


Wow. That’s crazy.
Link Posted: 5/17/2024 2:13:32 PM EDT
[#9]
Mind posting some pics? I will look at my 551s’ barrels this weekend. Mine are 2022 imports
Link Posted: 5/17/2024 3:20:16 PM EDT
[#10]
I’ll try this weekend
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