Question for you AR 15 Guys

Discussion in 'Technical Questions & Information' started by garydude, Oct 25, 2012.

  1. garydude

    garydude Member

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

    Attached Files:

  2. Snakedriver

    Snakedriver Active Member

    Mar 4, 2009
    SW. Florida
    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 Files:

    Last edited: Oct 25, 2012

  3. garydude

    garydude Member

    Thanks Snakedriver. Good stuff that.

    As to real world usefulness- zombie apocalypse? :D:D
  4. Helix_FR

    Helix_FR Active Member

    Apr 14, 2009
    Imperial, MO
    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,
  5. GunHugger

    GunHugger Well-Known Member

    Jul 18, 2007
    SW PA
    As an old Italian man once told me "you cana leada horse to water buta you no can makea him quench his thirst". :D
  6. zant

    zant Well-Known Member

    Sep 24, 2009
    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:))
  7. JLA

    JLA Well-Known Member

    Feb 26, 2007
    Heart Of Texas
    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.
  8. GunHugger

    GunHugger Well-Known Member

    Jul 18, 2007
    SW PA
    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 doesn't do anything except make it a little less front heavy.
  9. Maine04657

    Maine04657 New Member

    Sep 13, 2012
    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.
  10. zant

    zant Well-Known Member

    Sep 24, 2009
    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".
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