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Posted: 12/23/2005 10:51:27 AM EDT
[#1]
Tagged, I'll take a pic for you Seth if someone doesn't already have one to post. BTW, I would think it should run fine that way, if the bullet hits the ramp as it should it would feed ok. If it hits the receiver you're no worse off than with a standard extension barrel.
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Posted: 12/23/2005 11:43:06 AM EDT
[#2]
I don't have a pic, but you should have no problems with an M4 barrel extension mated with a non-M4 upper receiver.
Problems arise when you go the opposite route - non-M4 barrel extension with an M4 upper - due to the fact that a "wall" exists where the M4 ramps on an M4 upper meet the regular feed ramps on a non-M4 barrel extension. |
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Posted: 12/23/2005 12:30:30 PM EDT
[#3]
Thanks guys!
I guess I should've just asked this. Do all Colt M4 barrels have the proper M4 feedramps on the extension? I know some companies make them both ways. I have no idea if Colt does. |
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Posted: 12/23/2005 1:19:35 PM EDT
[#4]
I would assume that all Colt M4 barrels have the M4 feed ramps as well. I'm not sure of the ramps' inception date, but it would probably be a safe bet that all of them do. |
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Posted: 12/23/2005 1:23:18 PM EDT
[#5]
Is there a date of manufacturer stamped on your Colt barrel?
Colt began adding the M4 barrel extention to all of its carbine barrels in approx 1995 or 1996. |
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Posted: 12/23/2005 1:49:22 PM EDT
[#6]
No date on it anywhere. It's simply marked:
C MP 5.56 NATO 1/7 It probably does have the M4 extension on it. But I didn't know if Colt made some different configs like a lot of the barrel makers do nowadays. I think my question has been answered. Thanks all! |
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Posted: 12/23/2005 2:04:26 PM EDT
[#7]
As I understand it, current production is all M4 extentions on carbine barrels.
They do have 2 different versions of barrel assemblies with F-marked and standard front sight bases, but I think that would be the only current variation? |
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Posted: 12/23/2005 2:07:14 PM EDT
[#8]
Colt M4 barrel extensions have a "4" stamped on the right edge (looking straight ahead into the chamber). You might have to clean it well to see it.
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Posted: 12/23/2005 2:10:02 PM EDT
[#9]
 "4" near the ejection port |
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Posted: 12/23/2005 2:10:13 PM EDT
[#10]
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Posted: 12/23/2005 2:25:37 PM EDT
[#11]
That's exactly what I needed! Thanks!
There's no 4 on my extension, and after looking at that archived link I am positive I have a rifle extension. Looks as if I have a mixmaster stechild barrel 
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