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03-07-2008, 05:26 AM
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#1 |
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XDTalk 100 Member
Join Date: Mar 2008
Location: Cincinnati, OH
Posts: 178
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Information?
I have an upper assembly with no markings on it. The only marking is "4BI2" on the front sight bar right above the barrel.
Any suggestion and there is no barrle markings. How can I tell if it is chrome lined or not? It shoots ok, 1-1.5 MOA at 100 yards so I'm hapy with rifle but would like more information.
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"Don't criticize them; they are what we would be under the same circumstances"-- President Lincoln "Respect is earned not given" |
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03-07-2008, 03:52 PM
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#2 |
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XDTalk 2K Member
 
Join Date: Mar 2007
Location: Indiana
Posts: 2,870
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one guess is as good as another
 the marking on the FSB are the code for whoever forged the casting.
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AR15s...ya I've built more than a few  http://www.xdtalk.com/forums/ar-talk...ar-family.html |
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03-07-2008, 09:50 PM
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#3 |
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XDTalk 100 Member
Join Date: Oct 2007
Location: The Great State of Louisiana
Posts: 341
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Look at the chamber. If there is a shiny ring around it, it is chrome-lined. You can also see a small shiny ring around the muzzle as well. Not sure about your barrel codes.
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I'm The Walking Dude... |
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03-08-2008, 07:44 PM
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#4 |
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XDTalk 100 Member
Join Date: Mar 2008
Location: Cincinnati, OH
Posts: 178
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Thank you, I'm still trying to find out who made this upper.
It looks like there is an image or stamp of a lock o one side of the upper above the extraction port. ( a little towards the charging handle)
__________________
"Don't criticize them; they are what we would be under the same circumstances"-- President Lincoln "Respect is earned not given" |
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03-08-2008, 08:03 PM
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#5 |
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XDTalk 2K Member
Join Date: Mar 2007
Location: Indiana
Posts: 2,870
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That mark is the forge mark of Cerro Forge, looks like a "keyhole"
Cerro makes the raw forgings for alot of companies.
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AR15s...ya I've built more than a few http://www.xdtalk.com/forums/ar-talk...ar-family.html |
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03-08-2008, 08:07 PM
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#6 |
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XDTalk 15K Member
Join Date: Apr 2007
Location: Lancaster Co., PA
Posts: 17,478
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I thought we were going to be calling 411 for information.
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"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." - Thomas Jefferson |
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03-09-2008, 09:43 AM
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#7 |
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XDTalk 100 Member
Join Date: Mar 2008
Location: Cincinnati, OH
Posts: 178
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Is that good? Is this a quality upper?
__________________
"Don't criticize them; they are what we would be under the same circumstances"-- President Lincoln "Respect is earned not given" |
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03-09-2008, 09:45 AM
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#8 |
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XDTalk 2K Member
Join Date: Mar 2007
Location: Indiana
Posts: 2,870
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yes
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AR15s...ya I've built more than a few http://www.xdtalk.com/forums/ar-talk...ar-family.html |
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