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Posted: 10/29/2002 6:30:39 PM EDT
[#1]
On an AR board there is nobody who can answer this?
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Posted: 10/29/2002 6:37:56 PM EDT
[#2]
What brand? Chrome lined or unlined?
Those are clues that would help. General guess is that an M4 barrel would be chambered in 5.56, but as long as it isn't a target barrel, you should be ok with either. |
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Posted: 10/29/2002 6:42:13 PM EDT
[#3]
I know more information would be helpful, I don't have it. I have not yet received the upper. The seller says there are no markings on it - thus brand and chambering are unknown. I have read about M4 uppers that were chambered in .223. With the absence of markings how does one know?
Also how does one know the difference between chrome lined and chrome molly? |
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Posted: 10/29/2002 6:47:26 PM EDT
[#4]
chrome molly is the type of steel it is made from.
Chrome lined has an actual chrome lining in the chamber and bore. I wasn't aware of any .223 barrels that were chrome lined, but I don't know everything.[:D] |
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Posted: 10/29/2002 6:50:46 PM EDT
[#5]
Until I get it I guess I won't be able to figure that out unless the seller knows off the top of his head. Are you telling me that in general it is safe to shoot 5.56 from a .223 barrel? What did you mean by unless its a target barrel? Can you point me to any documentation that discusses the issue of whether 5.56 from a .223 barrel is safe?
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Posted: 10/29/2002 7:01:42 PM EDT
[#6]
[url]www.ammo-oracle.com/#m855yaw[/url]
Somewhere in there is your answer. |
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Posted: 10/29/2002 7:02:17 PM EDT
[#7]
HR, there is a good explanation out there, as in the "Molon Labe" page on Sniper Country. I had it but had to reload everything after the Klez virus and lost it. Someone will have it. IIRC, the 5.56 has a slightly longer throat area that allows a "hotter" load to be used w/o generating excessive pressure. This would allow you to shoot .223 Rem. in a 5.56, but would make the reverse dicey. Also, IIRC, most chambers these days (even Oly) are 5.56, except for some target bbls., as mentioned above. Someone will swoop in with the site, or you may be able to find it via search on Google.
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Posted: 10/29/2002 7:03:10 PM EDT
[#8]
I thought shooting shooting 5.56 out of a .223 chamber was a no-no?
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Posted: 10/29/2002 7:11:53 PM EDT
[#9]
Once again, forgive my ignorance, but barring markings to indicate which... how does one know what the rifle is chambered in? I just went through a FAC flyer and they show .223 M4 uppers, made by Hesse. Lord, I hope this is not a Hesse. There has to be a way to find this out?
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Posted: 10/29/2002 8:16:52 PM EDT
[#10]
Does anyone know if it being a preban would make a difference? Every Hesse I've seen is .223, but then again I've never seen a Hesse preban...
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Posted: 10/29/2002 8:26:02 PM EDT
[#11]
OK, found this on the Winchester LE site:
The 5.56mm and .223 Rem chambers are nearly identical. The difference is in the "Leade". Leade is defined as the portion of the barrel directly in front of the chamber where the rifling has been conically removed to allow room for the seated bullet. It is also more commonly known as the throat. Leade in a .223 Rem chamber is usually .085". In a 5.56mm chamber the leade is typically .162", or almost twice as much as in the 223 Rem chamber. ---------------------- Would it be possible to have the riling conically removed on a .223 barrel to match the 5.56 spec of .162 versus .085? Would this be cost prohibitive? |
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Posted: 10/29/2002 8:37:03 PM EDT
[#12]
Actually, the neck dia is a touch bigger in the 5.56 vs the SAMMI 223 Rem as well.
HR, if the barrel is not chrome-lined, any smith who has the proper chambering/throating reamers can ream it out very easily and simply for you. If it is chrome-lined it is probably 5.56 and you are stuck with it anyway, since reaming a chamber that has already been hard chromed is not practical. Please note that you don't want or need that long a throat in a chrome-moly or stainless barrel for best accuracy. I recommend the so-called "Wylde" chamber reamer - it is basically the NATO 5.56 chamber and neck with a shorter leade that will seat a Sierra 80 Match King at 2.475", touching the lands. Compass Lake (Frank White's) reamer is similar with a slightly shorter throat. These two reamers are favored for best accuracy in ARs. |
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Posted: 10/29/2002 8:41:59 PM EDT
[#13]
Of course it can be rechambered to 5.56. Any gunsmith should be able to do this for under $50.
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