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What is the notch in M4 profile barrels for?

Discussion in 'Black Rifle Forum' started by Cole125, Nov 20, 2011.

  1. Cole125

    Cole125 Silver Member

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    Far West, USA
    I have been wondering what purpose the notch or cut out in some M4 profile barrels is for. Anyone know? :dunno:

    This is what I am talking about, between the front sight and the flash hider.

    [​IMG]
     
    Last edited: Nov 20, 2011
  2. Retread1911

    Retread1911

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    It was for the old style grenade attachments.
     

  3. DWARREN123

    DWARREN123 Grumpy Old Guy Silver Member

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    That reduced area is for the grenade launcher mounting. :supergrin:
     
  4. cowboy1964

    cowboy1964

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    Kind of silly that most (?) commercial ARs for the common man still have that, isn't it?
     
  5. WoodenPlank

    WoodenPlank Who?

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    Easier to crank them out off of standard blanks, or buy from companies providing milspec barrels. Plus it shaves a little weight off, and I kinda like the look of it.
     
  6. arodgers

    arodgers

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    ...why?
     
  7. Eurodriver

    Eurodriver

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    More like your average Fudd gun owner walks into a gun store and wants "one of dem Arm-ee guns dat da neighbors boy two farms down was usin in the Aye-Rack place".
     
  8. JK-linux

    JK-linux

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    Get a mid length upper and it won't be an issue. ;)
     
  9. mixflip

    mixflip

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    There used to be a rumor that Bushmaster used M4 barrels with the M204 cutouts on their new cutting edge ACR because they had a huge stock pile of old M4 barrels on hand.

    The ACR couldnt fit an M203 grenade launcher if it wanted to but it still has the cutouts for one??? The logic makes sense but I dont know if its true or not?
     
  10. WoodenPlank

    WoodenPlank Who?

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    :dunno:

    Not sure what the point you are trying to make is....
     
  11. BBJones

    BBJones

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    He is saying they are on civilian guns because a certain segment of consumers want them there. He was denigrating idiots who walk into a gunstore and want to buy something that "looks" like what is current issue military gear. Many of the barrels that have the notch are not up to mil-spec (not chrome lined or made from proper steel etc.) (I am not looking to start a mil-spec war here) yet still have the notch.
     
  12. Eurodriver

    Eurodriver

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    Thanks.

    It has nothing to do with "barrel blanks" or "tooling" and everything to do with demand.
     
  13. jhooten

    jhooten NRA Life Member

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    So you can add your super-ninja-tacticle M203 lookalike 37mm flare launcher allowing you to be the coolest zombie swatter on your block.
     
  14. halfmoonclip

    halfmoonclip

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    From a practical standpoint, we civvies don't have much need of a bayo lug either, but we'd be disappointed to buy an AR without it.
    Clinton's attempt to tell us we couldn't have one was no help...
    Moon
     
  15. QNman

    QNman resU deretsigeR Silver Member

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    From a practical standpoint, we need very few features of the AR. Most - I'd venture to say nearly all - don't "need" an AR at all. I can defend my home, shoot prairie dogs, and fill a 30-round mag on many types of rifles that are not civilian military clones.

    I don't care for the cut - I think is looks kind of out of place. But then I think a lot of tacti-cool stuff is truly craptastic. YMMV.
     
  16. halfmoonclip

    halfmoonclip

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    Uh-oh, 'need' and 'gun' in the same sentence.
    My wife and I have had this conversation a couple of times.....
    Moon
     
  17. QNman

    QNman resU deretsigeR Silver Member

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    For the record, I find it incredibly shallow and somewhat narcissistic to refer to fellow gun owners as "Fudds" or to deride their choice in firearms because they like or dislike a specific cosmetic feature, brand, style, etc. We're either all in this and share a common love of firearms, or we're something else. I choose to see us generally together, whether it be farmer John who loves his 1946 side-by-side Winchester or mall-ninja Jimmy who has 17 tacticool accessories hanging on his $1,600 Colt.
     
  18. Spiffums

    Spiffums I.C.P.

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    My BCM upper had neither and I'm happy with it.
     
  19. Eurodriver

    Eurodriver

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    Please, just shutup.

    You know, or at least you should know, damn well that Fudd gun owners are not those who "dislike a specific cosmetic feature". If you truely believe that, you need to think harder.

    They are your good 'ole boys who would gladly vote for any candidate thinking he is "pro gun" because he doesn't want to take their hunting rifle away. They would take your AR15 away just as fast as Nancy Pelosi would because "Well, what do you need one of them for?"

    Fudd has nothing to do with BCM vs. DPMS, Surefire vs. LG, or Carbine length vs. Midlength and everything to do with being 2nd amendment friendly to all firearms.

    If you don't believe me, you haven't sat around some old school hunters long enough. Show up at a hunting club with your suppressed 10.3" AR15 with a flashlight and IR laser hanging off the end. See how many "No one needs a 30 round magazine in a gun!" comments you get.