Question for you AR 15 Guys - The Firearms Forum

garydude · 10-25-2012, 11:10 AM

What is the purpose of the (circled) indentation on the barrel shown?

Snakedriver · 10-25-2012, 12:17 PM

That barrel shown is a "Government Profile", and on a real military M4 rifle there is a 40mm grenade launcher (see M203) that can be mounted under the rifle barrel using that slot in the barrel as an attaching point. It has little if any real world usefulness on an AR-15 rifle, but some folks want everything to be "mil-spec".

garydude · 10-25-2012, 12:39 PM

Thanks Snakedriver. Good stuff that.

As to real world usefulness- zombie apocalypse?

Helix_FR · 10-25-2012, 07:02 PM

I had a guy ask me that same question about a week ago. I told him the same thing then he persisted on telling me that I was wrong bc he carried a m16 in Vietnam and they never had that. I said that is be its a M4 not a M16. he still didn't believe me,

GunHugger · 10-25-2012, 08:25 PM

Quote:

Originally Posted by Helix_FR

I had a guy ask me that same question about a week ago. I told him the same thing then he persisted on telling me that I was wrong bc he carried a m16 in Vietnam and they never had that. I said that is be its a M4 not a M16. he still didn't believe me,

As an old Italian man once told me "you cana leada horse to water buta you no can makea him quench his thirst".

zant · 10-25-2012, 08:39 PM

Yep,I don't understand the wanting this "feature" unless you gotta 203 to hang...but I don't understand having a "forward assist" either(nor did Stoner and Sullivan

)

JLA · 10-25-2012, 08:46 PM

I personally dont care for the forward assist or the dust cover on the ejection port. Im a big fan of the lo pro uppers DPMS offers.

GunHugger · 10-25-2012, 09:06 PM

Quote:

Originally Posted by zant

Yep,I don't understand the wanting this "feature" unless you gotta 203 to hang...but I don't understand having a "forward assist" either(nor did Stoner and Sullivan

)

I never "wanted" the 203 cut or needed it. But it's there on a few of mine and sure doesn't bother me that it's there...it doesn't do anything except make it a little less front heavy.

Maine04657 · 10-25-2012, 09:22 PM

Quote:

Originally Posted by Helix_FR

I had a guy ask me that same question about a week ago. I told him the same thing then he persisted on telling me that I was wrong bc he carried a m16 in Vietnam and they never had that. I said that is be its a M4 not a M16. he still didn't believe me,

Many of the Viet era barrels had the cut but to USE them you had to use the supplied hand gaurd that came with the 203.

zant · 10-25-2012, 09:28 PM

Quote:

Originally Posted by GunHugger

I never "wanted" the 203 cut or needed it. But it's there on a few of mine and sure doesn't bother me that it's there...it doesn't do anything except make it a little less front heavy.

I don't know how many people I've heard in gunshops think this is a cool feature...most that actually buy don't care,I have M4 feedramps but not the "ring".

10-25-2012, 11:10 AM	#1
garydude Senior Member Join Date: Feb 2010 Location: Desert Southwest Proper Contributor Posts: 749	Question for you AR 15 Guys What is the purpose of the (circled) indentation on the barrel shown? Attached Images -->

10-25-2012, 12:17 PM	#2
Snakedriver Advanced Senior Member Join Date: Mar 2009 Location: SW. Florida Posts: 1,219	Re: Question for you AR 15 Guys That barrel shown is a "Government Profile", and on a real military M4 rifle there is a 40mm grenade launcher (see M203) that can be mounted under the rifle barrel using that slot in the barrel as an attaching point. It has little if any real world usefulness on an AR-15 rifle, but some folks want everything to be "mil-spec". Attached Images __________________ Fear is a reaction..........Courage is a decision Last edited by Snakedriver; 10-25-2012 at 12:25 PM..

10-25-2012, 12:39 PM	#3
garydude Senior Member Join Date: Feb 2010 Location: Desert Southwest Proper Contributor Posts: 749	Re: Question for you AR 15 Guys Thanks Snakedriver. Good stuff that. As to real world usefulness- zombie apocalypse?

10-25-2012, 07:02 PM	#4
Helix_FR TFF Moderator/Host Join Date: Apr 2009 Location: Imperial, MO Posts: 3,628	Re: Question for you AR 15 Guys I had a guy ask me that same question about a week ago. I told him the same thing then he persisted on telling me that I was wrong bc he carried a m16 in Vietnam and they never had that. I said that is be its a M4 not a M16. he still didn't believe me, __________________ Only cowards shoot with their eyes closed.... helixgunsmith.com

10-25-2012, 08:39 PM	#6
zant V.I.P. Member Join Date: Sep 2009 Location: S.Al Posts: 249	Re: Question for you AR 15 Guys Yep,I don't understand the wanting this "feature" unless you gotta 203 to hang...but I don't understand having a "forward assist" either(nor did Stoner and Sullivan)

10-25-2012, 08:46 PM	#7
JLA TFF Moderator/Host Join Date: Feb 2007 Location: Heart Of Texas Contributor Posts: 17,321	Re: Question for you AR 15 Guys I personally dont care for the forward assist or the dust cover on the ejection port. Im a big fan of the lo pro uppers DPMS offers. __________________ It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze. The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do. Fact of life: After Monday and Tuesday, even the calendar says WTF!