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Author Topic: AR-15 bolt carrier key  (Read 14341 times)

Big Frank

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AR-15 bolt carrier key
« on: December 21, 2008, 03:56:33 PM »
I read a review today about the Charles Daly M4 style AR-15. They made a big deal about how the the bolt carrier key screws are staked in so they don't come loose. I thought all AR-15s had the carrier key screws staked at the factory, just like all real M4s and M16s do. I never saw any that weren't. I just checked both of my EBRs to confirm each screw is staked in two places. I was wondering if some of you guys can check yours and tell me if they're staked or not. If yours aren't staked I can show you the field expedient method that the army and marines use, plus an alternate method.
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Fatman

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Re: AR-15 bolt carrier key
« Reply #1 on: December 21, 2008, 06:16:54 PM »
Sounds like a 'fiddlely part ' issue.  I'll check mine when I'm in 'fiddlely part' fiddle. I've got to find a good exploded view of the AR15 - DPMS book is kinda sketchy on the illustrations.
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Big Frank

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Re: AR-15 bolt carrier key
« Reply #2 on: December 21, 2008, 07:45:30 PM »
When they said the screws were staked in... well, it seemed like saying the trigger is held in by a pin, or something equally obvious.
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""It may be laid down as a primary position, and the basis of our system, that every Citizen who enjoys the protection of a free Government, owes not only a proportion of his property, but even his personal services to the defence of it, and consequently that the Citizens of America (with a few legal and official exceptions) from 18 to 50 Years of Age should be borne on the Militia Rolls, provided with uniform Arms, and so far accustomed to the use of them, that the Total strength of the Country might be called forth at a Short Notice on any very interesting Emergency." - George Washington. Letter to Alexander Hamilton, Friday, May 02, 1783

THE RIGHT TO BUY WEAPONS IS THE RIGHT TO BE FREE - A. E. van Vogt, The Weapon Shops of Isher

MikeBjerum

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Re: AR-15 bolt carrier key
« Reply #3 on: December 21, 2008, 08:11:38 PM »
A lot* of reviews of anything are mostly written by press releases and just edited by the writer.  Have you ever listened to plumbing ads or reviews that talk about how little water their fixture use only to realize they are just following National codes on water usage, or car reviews talking about all the features of a car like power windows and locks, a/c, cruise, etc and then tried to find a car without those things?

Manufacturers will list everything on their product to make it look impressive, even if everyone has it.


*  Note that I said "a lot" not "all."
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Big Frank

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Re: AR-15 bolt carrier key
« Reply #4 on: December 21, 2008, 08:20:41 PM »
That's true. But I expect gun magazines and their writers to know more about a 50 year old design that they've reviewed over and over again. I almost said respected gun magazines.  ;)  Next they'll be telling us about a new M1911A1 that has some kind of new-fangled feature like a grip safety.  ::)
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""It may be laid down as a primary position, and the basis of our system, that every Citizen who enjoys the protection of a free Government, owes not only a proportion of his property, but even his personal services to the defence of it, and consequently that the Citizens of America (with a few legal and official exceptions) from 18 to 50 Years of Age should be borne on the Militia Rolls, provided with uniform Arms, and so far accustomed to the use of them, that the Total strength of the Country might be called forth at a Short Notice on any very interesting Emergency." - George Washington. Letter to Alexander Hamilton, Friday, May 02, 1783

THE RIGHT TO BUY WEAPONS IS THE RIGHT TO BE FREE - A. E. van Vogt, The Weapon Shops of Isher

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Re: AR-15 bolt carrier key
« Reply #5 on: Today at 02:24:43 AM »
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MikeBjerum

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Re: AR-15 bolt carrier key
« Reply #5 on: December 21, 2008, 08:28:55 PM »
Quote from: jumbofrank on December 21, 2008, 08:20:41 PM
That's true. But I expect gun magazines and their writers to know more about a 50 year old design that they've reviewed over and over again. I almost said respected gun magazines.  ;)  Next they'll be telling us about a new M1911A1 that has some kind of new-fangled feature like a grip safety.  ::)

Haven't you ever noticed the raves on the innovative grip safety on a polymer gun like it had just been invented, or the wonderful ergonomics  of the beaver tail on brand x's newly released 1911?  I don't see it in every gun review I read, but the common is re-hyped quite often.  Just last month I read of a new rifle with a "new innovative three position safety."  Ahhhhhhhhhhhhhh ... how long ago was this article written?
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Michael Bane

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Re: AR-15 bolt carrier key
« Reply #6 on: December 21, 2008, 08:44:41 PM »
Hey...they didn't even mention the chrome plated muffler bearing...

Michael B
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CurrieS103

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Re: AR-15 bolt carrier key
« Reply #7 on: December 21, 2008, 10:00:34 PM »
Or the the low energy used in the improved flux capacitor ;D
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Fatman

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Re: AR-15 bolt carrier key
« Reply #8 on: December 21, 2008, 10:02:41 PM »
Dambit! DPMS manual doesn't have either of those parts in the schematic!
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Me: Naw, we just apply a gun-shaped remedy to those extreme life threatening situations that call for it. All the less urgent problems we're willing to discuss.

jimbob_texas

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Re: AR-15 bolt carrier key
« Reply #9 on: January 04, 2009, 02:54:59 PM »
Quote from: jumbofrank on December 21, 2008, 03:56:33 PM
I read a review today about the Charles Daly M4 style AR-15. They made a big deal about how the the bolt carrier key screws are staked in so they don't come loose. I thought all AR-15s had the carrier key screws staked at the factory, just like all real M4s and M16s do. I never saw any that weren't. I just checked both of my EBRs to confirm each screw is staked in two places. I was wondering if some of you guys can check yours and tell me if they're staked or not. If yours aren't staked I can show you the field expedient method that the army and marines use, plus an alternate method.
A little late to this discussion...

Restating the obvious: all ARs should have staked keys.  Any gas leakage in the system will typically result in failures to extract and/or feed. 

I bought a Bushmaster several years ago that had the AK brake, A2 upper - I forget the model.  It ran great for a while, then I started getting extraction failures.  After some troubleshooting (and tossing a mag in a stock tank), I discovered that the carrier key screws weren't staked - a factory boo-boo.  Sent it back for a warranty fix, and all was well.   

jr
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