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CAR-15 Feed Ramps - Need advice

Discussion in 'Rifle Discussion' started by Liberty97045, Oct 13, 2014.

  1. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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    This question is about a CAR-15 from Olympic Arms. It is a range toy with a slide fire stock. It has the 11.5" barrel with the 5.5" welded flash hider.

    The gun is used for rapid fire and does on occasion misfeed during bump fire sessions and more so once it heats up.

    The gun does not have the M4 style feed ramps and I am thinking that adding them may help. I want to change the upper from a fixed handle to a flat top but I do not want to change the barrel.

    I am thinking that I can Dremel or hand file the barrel ramps once the new upper receiver is on.

    Thoughts?
     
  2. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    I would say using a file would be long and tedious, not to mention not all that accurate. I would inquire to OA if they can do the feed ramps on the barrel. Changing out the upper for one with feed ramps would be cake.
     
  3. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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  4. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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  5. Garg

    Garg east of portland metro Hold my beer..... watch this Bronze Supporter

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    Absolutely. Using a dremel tool would work, just go slow, and I would use a barrel with the ramps as an example. Changing out the barrel extension, unless your setup already has the extension, not built into the barrel, would be near impossible. You would also have to have it head spaced etc... Certainly something you would want a qualified gunsmith to do IMHO.

    Here is a decent article on the subject.

    http://www.ar15.com/forums/t_1_5/12...amps_Barrel_Extension_to_M4_Feed_Ramps__.html
     
  6. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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    Confirm headspacing is important. If you are planning to do this once, returning the gun to Olympic for service may be the more economical path.
     
    Garg likes this.
  7. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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    Dremel it is
     
  8. eldbillbo

    eldbillbo clackamas New world samurai and a redneck none the less Bronze Supporter

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    yeh installing and indexing a barrel extension is not for the novice builder and would not be cost effective to send to a smith. silly suggestion.

    if your receiver is a A1 i got a flat top i could trade you.

    also the problem may not even be because of the feedramps. could be ammo, mags, lube, extractor issue, buffer or buffer spring issue ect

    what kind of ammo are you using

    what type of mags are you using

    do you have a O ring in the extractor

    how many rounds on your buffer spring

    what type of buffer ? standard or H buffer?
     
    Last edited: Oct 15, 2014
  9. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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  10. eldbillbo

    eldbillbo clackamas New world samurai and a redneck none the less Bronze Supporter

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    its not a H buffer

    does it to it only with steel cased ammo or with brass cased also ?

    when it misfeeds what exactly happens does it pick up the round but just jams up trying to feed it like it goes part way but tilts too far up and gets stuck or does it actually go into the chamber but not all the way

    does the problem exist with all the mags you use? or just a particular one .

    does it do it with the pmags? if it does it with the Pmags as well as the other we can scratch mags off as being part of the problem.

    I am not trying to talk you out of installing feed ramps cause if done right it can't hurt anything .
     
  11. eldbillbo

    eldbillbo clackamas New world samurai and a redneck none the less Bronze Supporter

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    also looking at the photo appears your barrels ramps go over the edge which means if you get a receiver with shallow feedramps you may not need to dremel at all or at least very little
     
  12. Doc In UPlace

    Doc In UPlace Tacoma-ish Well-Known Member

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    Not.
    Worst idea I've heard all week. Taking a hand-held Dremel tool to a precision firearm to create CAR feed ramps is probably going to win the bad-idea-of-the-week award.

    But there's still tomorrow. Still in the running:

    1.) Shall I French-kiss an Ebola patient?
    2.) Is dating my wife's sister OK?
    3.) Draw an empty gun on some State Troopers, yes or no?
     
    jbett98 likes this.
  13. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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    Beater firearm actually
     
  14. jbett98

    jbett98 NW Oregon Bronze Supporter Bronze Supporter

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    I always ask myself, "What would John Moses Browning do when problems like this appear?"
     
    IronMonster likes this.
  15. IronMonster

    IronMonster Washington Opinionated Member Diamond Supporter

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    Actually in Patrick Sweeney's book "Gunsmithing for the AR-15" Using a dremel to extend the feed ramps is exactly what he recommends.
     
  16. IronMonster

    IronMonster Washington Opinionated Member Diamond Supporter

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    I had to look it up to see exactly what he said.

    Here is the quote from the book.

    "I ran into the problem of short-ramp feeding problems back in the 1980's. What I did then was to chuck a carbide end cutter into my dremel tool, and reaching from underneath the stripped receiver, cut the ramps down so they were low enough to "carry up" a cartridge that fed nose down. It worked then, and it works today. However, you will run into AR snobs. They will look at a rifle with dremeled feed ramps as some sort of butchery. (Well in the wrong hands, it can be.) If your rifle or carbine needs it, do it. If not, dont. Do it carefully, precisely, and as little as possible. Then dont let the snobs look in there."
     
    parallax likes this.
  17. Liberty97045

    Liberty97045 Oregon City Well-Known Member

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    "AR snobs", ouch!:rolleyes:

    A close cousin to the uber purist, best gun, best load snobs
     
    Last edited: Oct 18, 2014