AR15.Com Archives
 Whats the difference between a regular heavy barrel and an M-4 profile
Minator556  [Member]
5/4/2006 7:02:57 PM
Noob question here I was going to start a new build and was wondering what is the difference between a heavy barrel and an m-4 profile barrel other than one is lighter than the other and the price. I thought a heavier barrel was better because it could take more heat and a bit harder to bend and etc.

So is there any reason why I should get a M4 profile barrel other than looks or should I stick with a 16" heavy barrel.
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eklikwhoa  [Team Member]
5/4/2006 7:10:09 PM
the m4 has the step in it in front of the fsb. for mounting m203
hellbound  [Member]
5/4/2006 7:10:11 PM
the M4 profile will have the M203 cuts forward of the front sight block...
you can get them light or heavy under the handguards...

check out AR15 Barrels for pictures of the different barrel profiles...
Minator556  [Member]
5/4/2006 10:41:39 PM
so the only point of an m4 barrel is for an m203?
1911ar-15  [Team Member]
5/4/2006 11:06:37 PM

Originally Posted By Minator556:
so the only point of an m4 barrel is for an m203?



Yes. The fact that it's lighter (with the government profile) is a plus, but the cut itself is for the M203 only. The fact that it looks cool is just a bonus.
MC_2651_E5  [Member]
5/4/2006 11:12:08 PM
I've also been wondering about this. I need to get a 16 inch barrel and am looking at Bushmasters M4 dissipator barrel. I like the M4 look, but wonder if a heavy that is fluted would be better for a dissipator. Any ideas?
JosephR  [Team Member]
5/4/2006 11:27:09 PM

Originally Posted By MC_2651_E5:
I've also been wondering about this. I need to get a 16 inch barrel and am looking at Bushmasters M4 dissipator barrel. I like the M4 look, but wonder if a heavy that is fluted would be better for a dissipator. Any ideas?



yuck. get a 16" midlength instead. You don't need fluting or anything fancy.

AJBello  [Member]
5/4/2006 11:31:08 PM

Originally Posted By Minator556:
so the only point of an m4 barrel is for an m203?



Yep, pretty much. Everything else is just a side-effect (lighter weight, "cool" look ). There really isn't a functional purpose for the M4 profile barrel other than to attach a 203, and since I won't ever be doing that with my AR, I decided to opt for a 16" HBAR instead. To each his own I guess...
MC_2651_E5  [Member]
5/4/2006 11:49:28 PM
I want a dissipator because of the full sight radius. Although I guess it wouldnt be much different with a mid length.

AJBello: What is the difference between a heavy and a HBAR?
AJBello  [Member]
5/5/2006 12:55:04 AM

Originally Posted By MC_2651_E5:
I want a dissipator because of the full sight radius. Although I guess it wouldnt be much different with a mid length.

AJBello: What is the difference between a heavy and a HBAR?



Well I'm not an expert by any means but I think they are one in the same. HBAR = Heavy BARrel. That's the way my 16" Bushy is marked anyway, HBAR.
chas_martel  [Member]
5/5/2006 2:03:46 AM
I must be one of the few that think the M4 cut in the barrel is ugly!

Looks like the barrel would break off at the cut to me. Another
plus is the HBAR can take more rounds and not be as affected
by the high temp.
AJBello  [Member]
5/5/2006 2:10:06 AM

Originally Posted By chas_martel:
I must be one of the few that think the M4 cut in the barrel is ugly!

Looks like the barrel would break off at the cut to me. Another
plus is the HBAR can take more rounds and not be as affected
by the high temp.



Nope!

Actually, I don't necessarily think its UGLY, I just don't see the point in it (unless you have access to an M203). I suppose the appeal of it for some might be the military look and authenticity...?
chas_martel  [Member]
5/5/2006 2:16:21 AM

Originally Posted By AJBello:

Originally Posted By chas_martel:
I must be one of the few that think the M4 cut in the barrel is ugly!

Looks like the barrel would break off at the cut to me. Another
plus is the HBAR can take more rounds and not be as affected
by the high temp.



Nope!

Actually, I don't necessarily think its UGLY, I just don't see the point in it (unless you have access to an M203). I suppose the appeal of it for some might be the military look and authenticity...?



16" M4 <> authentic.

Maybe what I need to do is get an M203, then perhaps I would like the M4 cut.
Is that a tax stamp for each round?
MC_2651_E5  [Member]
5/5/2006 3:10:42 AM
Thanks for the clarification...I had a problem putting it togethor.

Any thoughts on a fluted HBAR?
AJBello  [Member]
5/5/2006 3:17:03 AM

Originally Posted By MC_2651_E5:
Thanks for the clarification...I had a problem putting it togethor.

Any thoughts on a fluted HBAR?



The only reason I would get the fluting is if I was concerned with weight. I think they are supposed to offer somewhat faster cooling too due to the larger surface area that the flutes create. I dunno, I think it's a total personal preference thing. If you like em, get em! I kinda like the clean straight lines of the 16" HBARs but that's just me.
JosephR  [Team Member]
5/5/2006 3:30:19 PM
Yes, a tax stamp for each DD round like HE or AP.

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